Malicious PDF — malware analysis report

Static analysis result for SHA-256 b567c97380cd786f…

MALICIOUS

PDF

51.4 KB Created: 2020-10-25 06:54:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 0c9bbb75332c48b2cc65570a92949f15 SHA-1: a612814ee12b22a776cfe7ab4a2bc38daa68260e SHA-256: b567c97380cd786f6c61a23f1c7f7a32c2dfeb538d63abacb4377a716e8ace0c
262 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/seluguwisuni-pesakogivipe-luvida.pdf.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.me/123?keyword=gmail+bypass+apk+app+download In PDF document text
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/seluguwisuni-pesakogivipe-luvida.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/6431815.pdfIn PDF document text
    • https://kudizuvawemexol.weebly.com/uploads/1/3/4/3/134307781/2716873.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/6059365.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369491/normal_5f8d43c2a968c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383131/normal_5f8dc0a151ec4.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00007216.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00007216.bin)
    • https://uploads.strikinglycdn.com/files/69485dc2-f52e-4400-858a-c734fd66ef1e/zaviroxesadalebiwofan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d61274b-0028-4e7e-9040-c875845aa8b6/45203561026.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35156b67-63bc-4c4a-9fd6-bf56b0aa6f71/sidudusumesidigagi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6432e822-4241-4ac1-b3d1-3f99a589079c/4464979075.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf02f460-93f9-42bb-9265-8054b2c4fa9b/71395330248.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1383500-7bfd-41c9-bd14-ff5505b2b71b/79250557414.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fda28eea-6843-4ea1-9170-4da58d78a630/gibiwefatisilaxunofakura.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9038/8151/files/chemistry_nomenclature_review_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6996/7013/files/finomugomawilusimabet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5598/8387/files/fratelli_ditalia_spartito.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5588/8022/files/thermoelectric_materials_thesis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3973/6487/files/r9_fury_x_benchmark.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4714/7925/files/sojuxukaforav.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn extracted file (font_00_sfnt_off00007216.bin)
    • http://dejavu.sourceforge.netIn extracted file (font_02_sfnt_off0000a9d2.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_02_sfnt_off0000a9d2.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7216 5440 bytes
SHA-256: 9b77f669d7246a729847280f6d16677418ce95de5d6a3f80f87551b34846f7a5
font_01_sfnt_off00008495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8495 10808 bytes
SHA-256: 1fa81c497e393cbeb0c58691cb80e1af490761fd5968a5aa3b203750159a3cdb
font_02_sfnt_off0000a9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9D2 16660 bytes
SHA-256: e7fcb312749b899b31f30f2a6d27aba9aac6e91f12c279fbbfda0fa187017d03