Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b163f0eda921493…

MALICIOUS

PDF

34.9 KB Created: 2020-08-16 23:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d379e0d6172365406d936cb02fa16253 SHA-1: cbddc6003fce990673e9c05ce3cd7d6af9cde1d5 SHA-256: 5b163f0eda9214939851c29e1e1c02b11ff52431c8269a73d9b8b86f603e1008
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body and embedded links suggest an attempt to manipulate search engine results or redirect users to malicious content, potentially for SEO spam or phishing. No scripts were extracted, but the presence of embedded links and the ML classifier's high confidence indicate malicious intent.

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=english+bible+niv+apk
    • http://files.hepcatclassics.com/uploads/1/3/2/8/132815015/waluxitufuko_nivigomiturep_donigaxevut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/9880/7202/files/xibuvulivedonisupiji.pdf
    • https://cdn.shopify.com/s/files/1/0431/8163/7794/files/fofapeguwamolaxe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lafiku.pdf
    • https://cdn.shopify.com/s/files/1/0434/6321/3209/files/46300344206.pdf
    • https://cdn.shopify.com/s/files/1/0433/0989/1742/files/70762039388.pdf
    • https://cdn.shopify.com/s/files/1/0435/1878/7743/files/bones_sodium_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0448/1184/5793/files/eec_ma_incident_report.pdf
    • https://cdn.shopify.com/s/files/1/0432/7967/9656/files/rinuzibirafo.pdf
    • https://cdn.shopify.com/s/files/1/0428/3862/2375/files/64592377442.pdf
    • https://cdn.shopify.com/s/files/1/0433/2408/0282/files/calculator_gallery_vault.pdf
    • https://cdn.shopify.com/s/files/1/0430/6219/8425/files/rikalobasenabajujixa.pdf
    • https://cdn.shopify.com/s/files/1/0431/7554/2950/files/2_bestanden_samenvoegen_mac.pdf
    • https://cdn.shopify.com/s/files/1/0430/6350/9143/files/launching_soon_website_template.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_off00004bb3.bin
0d5ce67f22f4175e4ae1988275e8e036195aa0a7df7e88354dc2fb7ea437fe8b
pdf-font-stream PDF embedded font (sfnt) at offset 0x4BB3 5204 bytes
font_01_sfnt_off00005d72.bin
0d849a565f21cdfa23e9942431fa9bfbc13d46f9133fe1fb60bdc2f07c574e07
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D72 9864 bytes