Malicious PDF — malware analysis report

Static analysis result for SHA-256 f17c7c3edaae77c1…

MALICIOUS

PDF

40.9 KB Created: 2020-08-19 05:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 217819979e6d133bdefe01234f982f89 SHA-1: 6d32e9de6da9d599a7207d00bfc65ed9759d7f4a SHA-256: f17c7c3edaae77c1920d16c9a6166bd2885a7f68f45e4c28f0a2b5f7423a0522
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • 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.ru/pify?keyword=chemical+bonding+class+11+notes+pdf In PDF document text
    • http://files.myheartbelongsto.com/uploads/1/3/1/4/131409309/f72e0829957892f.pdfIn PDF document text
    • http://files.lailaiorlando.com/uploads/1/3/2/7/132741169/ef36467b775ada4.pdfIn PDF document text
    • http://tuwobugu.cs.ogdcl-nthp.com/uploads/1/3/1/6/131606066/b728b1eb1687951.pdfIn PDF document text
    • http://sopug.americanlegioncleveland.org/uploads/1/3/0/7/130738638/zitatuta.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3421/2509/files/80678440506.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8575/6568/files/41394825086.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/6565103434.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/kewokirugegajiviro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1077/6478/files/motorola_s11-_hd_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5109/0077/files/sosivata.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7354/4093/files/access_my_icloud_photos_on_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8030/3270/files/applied_psychology_in_human_resource_management_cascio.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6539/2804/files/five_minute_activities_for_young_learners.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6239/4008/files/create_new_branch_in_github.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4886/9789/files/kiwazatexeremovivoxav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9893/8274/files/5947267877.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8839/6959/files/gojosibosi.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61E0 5568 bytes
SHA-256: 616d48fa25f7b8ec888ec84cb908c1d55acebcf03144ad4d6b728dc489fabc75
font_01_sfnt_off000074a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74A7 9876 bytes
SHA-256: 93a2c5f25d8307c5b288d31af80256d78228388f4b3143c855933a45a3bda313

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