Malicious PDF — malware analysis report

Static analysis result for SHA-256 614ae52a605afffb…

MALICIOUS

PDF

52.2 KB Created: 2020-08-21 15:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 401848d1c5aa7d3686bd4f0bd988d87d SHA-1: 6aa80b744e4ff2e70f90e934ca64d110822ccc4f SHA-256: 614ae52a605afffb6ed12eb067036254fd6e8748307018b84961613578417b1e
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 of which point to redirector infrastructure or link farms, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The primary malicious URL identified is https://ttraff.com/pify?keyword=soul+calibur+voldo+guide, which is likely used to redirect the user to further malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=soul+calibur+voldo+guide
    • http://sajogexi.northwestchromerdomers.com/uploads/1/3/2/3/132302921/virawuniv.pdf
    • http://files.gardencityfsc.com/uploads/1/3/0/7/130776016/3727174.pdf
    • http://fugana.xquisitebalance.com/uploads/1/3/1/8/131856772/lakisezow.pdf
    • http://files.cokosscrubs.com/uploads/1/3/0/7/130738641/678690.pdf
    • http://files.listenlikelearnmusic.com/uploads/1/3/1/3/131398093/losoxadazezufigogepo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/2663/5162/files/mojibexu.pdf
    • https://cdn.shopify.com/s/files/1/0436/9724/2280/files/fao_56_evapotranspiration.pdf
    • https://cdn.shopify.com/s/files/1/0428/4976/3487/files/63738483199.pdf
    • https://cdn.shopify.com/s/files/1/0437/7218/2685/files/varupavis.pdf
    • https://cdn.shopify.com/s/files/1/0434/4463/3756/files/94775879431.pdf
    • https://cdn.shopify.com/s/files/1/0434/0491/8941/files/nopizexuxobalewotunogas.pdf
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/probability_theory_and_stochastic_processes_for_engineers.pdf
    • https://cdn.shopify.com/s/files/1/0429/7513/3859/files/85946997150.pdf
    • https://cdn.shopify.com/s/files/1/0431/6912/0413/files/bickerstaff_encephalitis.pdf
    • https://cdn.shopify.com/s/files/1/0437/1054/6070/files/ahs_season_3_episode_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/3737/6157/files/67229954866.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_off00008e4c.bin
20782cebf92200d1906e8b72d6c81ebed2d0d48f35d85bab36dce79492e910a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E4C 5232 bytes
font_01_sfnt_off0000a01e.bin
7728275e9dad3a5ab7402e9b5dcca3b027779a028ab7af010784866002d20d51		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA01E 10400 bytes

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