Malicious PDF — malware analysis report

Static analysis result for SHA-256 67f846b3f638109e…

MALICIOUS

PDF

56.6 KB Created: 2020-07-26 07:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82cd29897cb169f9a06f0ba148ed46d2 SHA-1: 1adfb610f78fcf5f1514e7b660c6e256a34736f1 SHA-256: 67f846b3f638109e9578dfd13f1125fcf9fa114f44ab66ec8b0a6bc206f144ae
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, though heavily obfuscated, appears to be related to 'fracture callus formation', suggesting a lure. The presence of a large number of external PDF links points towards a link farm or SEO poisoning tactic. No scripts were extracted, but the primary attack vector appears to be directing users to malicious infrastructure via embedded links.

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=fracture+callus+formation
    • http://files.carterandcompanybroker.com/uploads/1/3/2/6/132681576/1013279.pdf
    • http://files.kanemiller.com/uploads/1/3/2/3/132302830/jaxapi_pomam_nurozulojoduz.pdf
    • http://files.afrocubanforum.org/uploads/1/3/0/8/130874317/xafeluxo-fefagasezo-gepubesasilit-busamozagomum.pdf
    • http://files.vancepta.com/uploads/1/3/1/3/131379543/ropesesazozola-mininasojoda-nisuxurolotawu.pdf
    • http://files.purpleribbonpublishing.com/uploads/1/3/1/6/131606016/katos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1588/9305/files/kozowapuwaxuvawisut.pdf
    • https://cdn.shopify.com/s/files/1/0431/9189/4176/files/kanuzenozup.pdf
    • https://cdn.shopify.com/s/files/1/0436/3590/0569/files/sogogakatul.pdf
    • https://cdn.shopify.com/s/files/1/0431/3019/2039/files/wototewopejijibivexozav.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/loxidunadubufurepetiverox.pdf
    • https://cdn.shopify.com/s/files/1/0428/2925/0719/files/lasax.pdf
    • https://cdn.shopify.com/s/files/1/0440/6099/9830/files/joxedapopibupokonowe.pdf
    • https://cdn.shopify.com/s/files/1/0433/4383/9385/files/fitimewugasasijipebarasom.pdf
    • https://cdn.shopify.com/s/files/1/0430/8582/4154/files/sasofomoli.pdf
    • https://cdn.shopify.com/s/files/1/0440/8619/8424/files/46430091285.pdf
    • https://cdn.shopify.com/s/files/1/0431/5122/9089/files/88009352372.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_off0000a2b2.bin
c252bc1a37eb61b0506254c419ed48640241d13abb5bdf21ad3bff2c29000cae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2B2 4864 bytes
font_01_sfnt_off0000b31a.bin
a5a0b800ce97ea821d399ef13a253875739868314cdf274474f9bf8254684c47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB31A 9908 bytes

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