Malicious PDF — malware analysis report

Static analysis result for SHA-256 622715c51ebf1084…

MALICIOUS

PDF

41.3 KB Created: 2020-08-11 13:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae4a9966e713437ea47a662b14fe1e06 SHA-1: 7d7663c32db00d804289c0b6a88f4c22bd30e67a SHA-256: 622715c51ebf10840258d70c3fd7d6052db007bf97537624e5e04431fe5b20e6
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.cc'. This suggests the document is part of a link farm or SEO manipulation scheme designed to drive traffic to malicious infrastructure. The ML classifier strongly supports the malicious verdict, and the presence of embedded URLs indicates an attempt to direct users to external content.

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=ejercicios+resueltos+de+centroides+y+centros+de+gravedad+pdf
    • http://files.copperchiefstore.com/uploads/1/3/0/8/130815014/7798345.pdf
    • http://tunabomi.conceptfrontier.com/uploads/1/3/2/8/132814930/6766961.pdf
    • http://files.dogodogo.ru/uploads/1/3/2/7/132712233/a765cf91460497.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/4826/4089/files/91223909948.pdf
    • https://cdn.shopify.com/s/files/1/0434/7900/7398/files/neurological_voice_disorders.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/redukenedobitaguwowok.pdf
    • https://cdn.shopify.com/s/files/1/0434/7379/7285/files/94785308255.pdf
    • https://cdn.shopify.com/s/files/1/0434/2136/8472/files/jetevenekuwiv.pdf
    • https://cdn.shopify.com/s/files/1/0441/0081/2952/files/usps_customs_forms.pdf
    • https://cdn.shopify.com/s/files/1/0434/1396/2919/files/mutufidit.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/45204585061.pdf
    • https://cdn.shopify.com/s/files/1/0428/9350/8771/files/fejabubofi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0790/9794/files/xerifemigevumosi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2621/8134/files/40258050690.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_off0000617a.bin
f9e8562877a261675bbfcd26762f791b2e99135c5558874d2fb018183147764e
pdf-font-stream PDF embedded font (sfnt) at offset 0x617A 5520 bytes
font_01_sfnt_off00007467.bin
12a2ff593bc5118227ea8a90c80046916ba133f7ceebc91cccb863e0c8ff1fe3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7467 10964 bytes