Malicious PDF — malware analysis report

Static analysis result for SHA-256 8793a47677a3fa6a…

MALICIOUS

PDF

36.7 KB Created: 2020-09-12 19:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f39199d656ddd4d62f04748f890f968e SHA-1: 40a9a3a0f9e04e9820af437fea29289adc13d04a SHA-256: 8793a47677a3fa6a1d7f05201afebe63300cb93a04849e9445c499e24e46f28f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to disposable hosting and a malicious redirector. The primary malicious URL, 'https://ttraff.link/pify?keyword=biointeractive+ecology+answer+key', is designed to lure users into clicking by impersonating an answer key. The document's structure and link farm nature suggest it is intended to distribute further malicious content or lead users to phishing sites.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=biointeractive+ecology+answer+key
    • http://files.fuelyourvibe.com/uploads/1/3/0/7/130739060/282d717a.pdf
    • http://zazajaf.jaclynfishlerportfolio.com/uploads/1/3/0/9/130969465/0158b88d839.pdf
    • http://files.apellasolutions.com/uploads/1/3/0/9/130969260/bigopubekefexewipog.pdf
    • http://files.durbandrags.com/uploads/1/3/1/4/131438449/duporamufulepal_wurusifu_vupuxebevop_nolupumi.pdf
    • http://files.drsandeepreddy.com/uploads/1/3/1/4/131409090/motiliforuxo.pdf
    • http://files.towsonmartialarts.com/uploads/1/3/1/0/131070820/ef71d2ade99cb.pdf
    • http://files.truewealthfg.com/uploads/1/3/2/7/132710687/migejowo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/3862/2375/files/85393756412.pdf
    • https://cdn.shopify.com/s/files/1/0436/8944/3483/files/fitted_double_bed_sheet_tesco.pdf
    • https://cdn.shopify.com/s/files/1/0436/5120/3225/files/agronomy_and_its_scope.pdf
    • https://cdn.shopify.com/s/files/1/0436/9452/2523/files/larozofazakozoderemituvab.pdf
    • https://static.usrfiles.com/ugd/8c5bc8_6c913f8ef5c4423b95cb5add5f5096bd.pdf
    • https://static.usrfiles.com/ugd/3e9e83_62c20019949249d5ae346e02e7c4e51b.pdf
    • https://static.usrfiles.com/ugd/1cc777_5b0272dc1d1d49d398ef2ec14650a670.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce9bef7a5b524514a2015b534cdf4826.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d04.bin
c091c9a856b770e18ec89c6dc35267b6449f225729295f8b74e87bb3b97f1628		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D04 5336 bytes
font_01_sfnt_off00005f58.bin
56c3449295588908144070ca1f94a35f340450f04b5fd8f1347f23bbac3128b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F58 12252 bytes

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