Malicious PDF — malware analysis report

Static analysis result for SHA-256 174c759b75a2e45a…

MALICIOUS

PDF

33.6 KB Created: 2020-08-21 19:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9840d08b90154ebc844e86a8860baf86 SHA-1: 5d95fb9ab4d20c11e20ec99b0d985d5f31633f50 SHA-256: 174c759b75a2e45afb5590c0f5414f55df1ab82fe3d83518bada97256c1d8f42
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify and other domains, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure, indicating a phishing or malware distribution vector. The ML classifier strongly supports the malicious nature of this PDF.

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.ru/pify?keyword=new+headway+advanced+vocabulary+list+pdf In PDF document text
    • http://gumubinin.oakleighminiatures.co.uk/uploads/1/3/0/8/130874254/bumegusujumo.pdfIn PDF document text
    • http://files.forestfreshproducts.com/uploads/1/3/0/7/130739696/65d4289e.pdfIn PDF document text
    • http://files.pureessentialslightcenter.com/uploads/1/3/1/4/131407111/bogokasuwoke_dofekanil_xolivanita.pdfIn PDF document text
    • http://juloz.denverrceagles.org/uploads/1/3/2/7/132741555/nugaf.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/1/0432/9019/8180/files/wevapapepijibabinu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/1890/0888/files/edit_text_in_mac_preview.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3459/8809/files/7335469759.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2563/6250/files/2003_honda_accord_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7701/8524/files/raxozamefadejivudor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7313/2957/files/safari_clip_arts.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7967/0689/files/jilevamotitagalaki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7120/1695/files/93284831602.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/2856/7448/files/multiple_choice_questions_on_genetics_and_heredity.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8547/0623/files/jomewebirazebutesevukube.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1368/4891/files/zulujuxideluwakepu.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_off00004a68.bin
b1cefc68a26cae792b13db6353d53a5b48cce36b5b3b6e20d64e18ce8d6ba64f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A68 5604 bytes
font_01_sfnt_off00005d82.bin
e773614071de9f07471cab11773311bfb5127553305f2e3fc413a50838078600		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D82 8340 bytes

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