Malicious PDF — malware analysis report

Static analysis result for SHA-256 6850d26211b1974a…

MALICIOUS

PDF

49.3 KB Created: 2020-11-02 14:58:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: df78004fb92e0b9556627750ab41f841 SHA-1: 301334974f5bc312810e94ebb869db272217ec13 SHA-256: 6850d26211b1974a21e8df82fab5d53306a092b13ae5eda66d9531448b61241b
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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.
  • 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=skyrim+lynly+star-sung In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f90b941683a2.pdfIn PDF document text
    • https://rizulibix.weebly.com/uploads/1/3/4/3/134358491/4330574.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/kugapusefepafazixa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422371/normal_5f9eac9676943.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf3b1490-5e86-4703-8d6c-fe7800daa157/18803601865.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/6432/5792/files/1835544396.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4aed9f7-10d6-4d2d-814b-f547b8d8c02b/59969860441.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/9406/3269/files/irs_form_2210_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/562208a5-ee5c-4d0a-af37-2471da1a561f/kedorugugofu.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/32621295756.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dcbb848-8714-4837-9077-2920b832bf78/newefuwemijitudagowokuro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3bce2d1-b18e-4e10-b95c-7b27a2bf0f17/gineduruxafizaxiwepudo.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/38776694442.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ed22a1d-cc6c-49ab-9ee7-5af810512044/40922854398.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 PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000578f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x578F 7812 bytes
SHA-256: dea1eb9571b28e0455502fa27f69f2e3aeac94cf7a65afc2ecebb31df26e65d3
font_01_sfnt_off0000714e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x714E 5304 bytes
SHA-256: f1a84a6e89a81f61c7c7c253e587195796a7b183dbdbcbad90c7d231c97c05b9
font_02_sfnt_off00008348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8348 5672 bytes
SHA-256: a934226880df602021ecdb863c829cbd010f0c6edac877d3c45c0d6c3a66e91b
font_03_sfnt_off00009156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9156 11012 bytes
SHA-256: ce19dcbf1d2e0df27488240babdc536e71887b5434ca6fc4063734cb5c67eeb4

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