Malicious PDF — malware analysis report

Static analysis result for SHA-256 7794d1cebf20bce5…

MALICIOUS

PDF

43.9 KB Created: 2020-10-05 10:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 81132d4a37a20788dea692176a5a6c2e SHA-1: e8b9d0617170248563f83703a6f3900f208fe86a SHA-256: 7794d1cebf20bce5d1b277d276dbd161d4576af09cf4ec54188578b8be5eb20f
214 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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.link/pify?keyword=provo+mtc+zip+code In PDF document text
    • https://site-1036630.mozfiles.com/files/1036630/93466910360.pdfIn PDF document text
    • https://site-1040288.mozfiles.com/files/1040288/88535560188.pdfIn PDF document text
    • https://site-1041611.mozfiles.com/files/1041611/21670416746.pdfIn PDF document text
    • https://site-1039342.mozfiles.com/files/1039342/zerixiresovomekuku.pdfIn PDF document text
    • https://site-1036627.mozfiles.com/files/1036627/benazogolumuwikogiwagodo.pdfIn PDF document text
    • http://sewusuve.thatclass.org/uploads/1/3/0/8/130813577/wumoj.pdfIn PDF document text
    • http://files.superkickfoundation.org/uploads/1/3/2/7/132740275/bbc8e8186ec36.pdfIn PDF document text
    • http://files.happycat.tips/uploads/1/3/0/8/130874189/8307816.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/1/0480/4742/3652/files/wamefawurisudejitivid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/1043/6515/files/acknowledgement_in_journal_article_example.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8200/6172/files/biggest_domestic_cat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/4758/3383/files/komerumofurolidoxiwowofab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3422/0456/files/grindr_apk_download_old_version.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4313/4362/files/rafagaditokirelumadi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5654/4409/files/61685237788.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_off00006eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EBA 4908 bytes
SHA-256: 707e969de9c070f6c634c1540267875bf0a567aec72cec280f5841df758f9f6f
font_01_sfnt_off00007f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F68 10436 bytes
SHA-256: f74cf0d7a1783a86db90aa334602e499fdd34d97ca4a9d71e296cbeb65b18664

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