Malicious PDF — malware analysis report

Static analysis result for SHA-256 6112377e4b3cc549…

MALICIOUS

PDF

36.3 KB Created: 2020-08-19 19:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f8f705cad04547f61d15fb943fa7ee5 SHA-1: c4dba110dbdef455c1bbdcc44ee5e767397669b9 SHA-256: 6112377e4b3cc5498b8e07f7e58765ffe96d0b2d54b9c38367c2853186fad10f
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for an arrest report, and the presence of numerous external PDF links suggests a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness.

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=kirbyville+banner+arrest+report
    • http://files.matteozamariaphotography.com/uploads/1/3/2/7/132740193/8834371.pdf
    • http://files.artinfluxlondon.com/uploads/1/3/1/1/131164479/wexokesajur_zukewusilipam.pdf
    • http://files.tenthstreetmiscellany.com/uploads/1/3/1/3/131379545/kedidepuf-fesalodomow-sufidogekobasad.pdf
    • http://files.tanawanhandycraft.com/uploads/1/3/0/7/130776245/e029c7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/0501/6225/files/rerajagasepor.pdf
    • https://cdn.shopify.com/s/files/1/0443/0499/0364/files/atharva_veda_in_bengali_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/8582/4164/files/nerodalevefudituveki.pdf
    • https://cdn.shopify.com/s/files/1/0440/3891/4213/files/85153135743.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xekugoxozeritazol.pdf
    • https://cdn.shopify.com/s/files/1/0433/6209/1163/files/poruva.pdf
    • https://cdn.shopify.com/s/files/1/0427/6404/2396/files/xejupiluj.pdf
    • https://cdn.shopify.com/s/files/1/0431/8501/2900/files/90643211963.pdf
    • https://cdn.shopify.com/s/files/1/0431/8052/3678/files/brisbane_tv_guide_yesterday.pdf
    • https://cdn.shopify.com/s/files/1/0432/5317/0334/files/global_times_reporter_hong_kong_airport.pdf
    • https://cdn.shopify.com/s/files/1/0433/6379/5096/files/43340930313.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_off00005000.bin
6f9ef765cdc841f0290781e67b46d87bd6b3123ee08997217690c89f9042e2d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x5000 5084 bytes
font_01_sfnt_off0000615a.bin
8e23e5dd6ca69c341b2afa6dc3193fb0549add122630d48a88e0e3920412dbba
pdf-font-stream PDF embedded font (sfnt) at offset 0x615A 10312 bytes