Malicious PDF — malware analysis report

Static analysis result for SHA-256 b210c75cf9464cc0…

MALICIOUS

PDF

41.1 KB Created: 2020-08-20 22:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3541b28d3f72066f5e710fbc64a06a70 SHA-1: fcb1d83788db23ac6f8155f909c6d3025bf5eb23 SHA-256: b210c75cf9464cc05d3b91830f8f35893e7f24a5a2dfd7516d9a4bf9b86e7eb1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is designed to lead users to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive document and malicious links.

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=active+and+passive+exercises+with+answers+pdf
    • http://wopofi.jolvi.ca/uploads/1/3/2/6/132695306/3be77d1445.pdf
    • http://files.morocco.ency-education.com/uploads/1/3/1/3/131383860/ea093a1ef383.pdf
    • http://files.classicfilmworks.com/uploads/1/3/1/0/131069934/bebubunu.pdf
    • http://files.grapeofthevinegoatmilksoap.com/uploads/1/3/0/7/130738501/5893977.pdf
    • https://cdn.shopify.com/s/files/1/0428/1538/9855/files/miperubububuzi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4015/3505/files/karagivox.pdf
    • https://cdn.shopify.com/s/files/1/0428/5048/4390/files/beauty_standards_around_the_world.pdf
    • https://cdn.shopify.com/s/files/1/0428/6735/9900/files/vuwerosokobutu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0747/files/59684959353.pdf
    • https://cdn.shopify.com/s/files/1/0440/3865/2069/files/zonaxalitamaxuwaxakem.pdf
    • https://cdn.shopify.com/s/files/1/0433/2912/6550/files/1111720574.pdf
    • https://cdn.shopify.com/s/files/1/0435/9569/4239/files/zotazijuwimorim.pdf
    • https://cdn.shopify.com/s/files/1/0432/0473/9232/files/fafiwosebafojota.pdf
    • https://cdn.shopify.com/s/files/1/0431/2740/6746/files/53416339743.pdf
    • https://cdn.shopify.com/s/files/1/0435/8111/2483/files/super_mario_nes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91300886864.pdf
    • https://cdn.shopify.com/s/files/1/0435/8068/6495/files/adeste_fideles_satb.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006245.bin
ed51b07a4424becc62eddd1511f4ff397cb7117ce65e5951e3e14a911ba8d846		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6245 5420 bytes
font_01_sfnt_off000074c5.bin
811ff4273119a323abff3050de36b8964ca166bfa54c0cf85c0308fcb0559cb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74C5 10240 bytes

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