Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6d5c5120a62a0b…

MALICIOUS

PDF

34.9 KB Created: 2020-08-20 11:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf21e84ed704fdcc8d88bac953c147ec SHA-1: de647a50ca966b05ea4a9889589f114f36348fa4 SHA-256: 5a6d5c5120a62a0b757675ad1d25f799ae15f3cade42f868b152fc2feb4ea36d
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 pointing to Shopify domains hosting other PDFs, likely as part of a link farm or SEO manipulation scheme. One of these links, https://ttraff.cc/pify?keyword=bodo+video++mp4+2017, is known to lead to malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this document is designed to lead users to harmful sites.

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=bodo+video++mp4+2017
    • http://files.emathacademy.com/uploads/1/3/0/9/130970003/wisefalikov.pdf
    • http://files.yesforoakcreekschools.com/uploads/1/3/0/7/130740530/95fbc27.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0435/8825/5912/files/the_seekers_daniel_boorstin.pdf
    • https://cdn.shopify.com/s/files/1/0447/9565/8389/files/credit_risk_modelling_springer.pdf
    • https://cdn.shopify.com/s/files/1/0431/3494/3388/files/jikeg.pdf
    • https://cdn.shopify.com/s/files/1/0435/4244/6231/files/54322576791.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84574839703.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zonixalekena.pdf
    • https://cdn.shopify.com/s/files/1/0434/9050/8960/files/93545564664.pdf
    • https://cdn.shopify.com/s/files/1/0432/1935/3757/files/fapulasojibalisumow.pdf
    • https://cdn.shopify.com/s/files/1/0443/1475/5228/files/etiologia_da_doena_periodontal.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004046.bin
144325463af7bf34534d0e54842e7ba4b62c2dc53870796fc69543716eddc6f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x4046 5192 bytes
font_01_sfnt_off0000520e.bin
6e94c7cf6f1312fac04e76ca61ddbff6674f2d4899e4498619907aa33f532a18
pdf-font-stream PDF embedded font (sfnt) at offset 0x520E 9336 bytes
font_02_sfnt_off00007228.bin
345dad2fe3bcf6e0032ba761a7dceb9ccefcb7617719e82e85b9c406e7fd7b96
pdf-font-stream PDF embedded font (sfnt) at offset 0x7228 3300 bytes