Malicious PDF — malware analysis report

Static analysis result for SHA-256 7070e4fb018b226a…

MALICIOUS

PDF

34.5 KB Created: 2020-08-10 21:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 418a8c316a1516c0b83cad2c212b3555 SHA-1: 3fc5fa689adb88a7f29dc304bdc2148fba4934fb SHA-256: 7070e4fb018b226a9821c6266df2d42c9c8ab88548e5e420c1ee12dbad8980be
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a malicious redirector link disguised as a free download for an English speaking course. The ML classifier strongly flagged this PDF as malicious, and it contains numerous links to external PDF files, many hosted on Shopify, likely as part of an SEO link farm to improve search engine ranking for malicious content. No scripts were extracted, but the presence of a malicious redirector and the link farm indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.cc/pify?keyword=rapidex+english+speaking+course+pdf+download+free
    • http://wagitedo.thelostartoffemininity.com/uploads/1/3/0/7/130776445/1677735.pdf
    • http://files.salolimoments.com/uploads/1/3/1/4/131454270/1966398.pdf
    • http://daxuralu.cogio.ca/uploads/1/3/1/4/131453267/646d16275.pdf
    • http://files.stjudescedarcity.net/uploads/1/3/1/0/131070151/3114709.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0673/0144/files/fijegote.pdf
    • https://cdn.shopify.com/s/files/1/0430/9952/1181/files/15459773873.pdf
    • https://cdn.shopify.com/s/files/1/0430/8549/6482/files/zamavujaridexavip.pdf
    • https://cdn.shopify.com/s/files/1/0437/1818/1013/files/54707008162.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gevuruliwineda.pdf
    • https://cdn.shopify.com/s/files/1/0438/4620/5602/files/wamenaziluz.pdf
    • https://cdn.shopify.com/s/files/1/0431/4556/0219/files/33736316564.pdf
    • https://cdn.shopify.com/s/files/1/0434/3840/7845/files/nifapijogote.pdf
    • https://cdn.shopify.com/s/files/1/0431/5188/4445/files/kunipoxolosi.pdf
    • https://cdn.shopify.com/s/files/1/0435/9097/5647/files/39674065913.pdf
    • https://cdn.shopify.com/s/files/1/0428/0342/9535/files/58077571673.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6648/files/43120876262.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_off000048a9.bin
c082edd4f7d9398b8485a526555af7097d493427809824a350ad95bf71c0359e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48A9 5648 bytes
font_01_sfnt_off00005bf1.bin
7d1138d7e900a715f40b0967529a3ee9d8a1452c800f711abd2034a796023d96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BF1 9668 bytes

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