Malicious PDF — malware analysis report

Static analysis result for SHA-256 428c7894c925247e…

MALICIOUS

PDF

41.0 KB Created: 2020-10-28 20:05:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 652e6619e1b28b14887a4c672f578e1f SHA-1: 7721d78368f743f8047577b1dc57104af4aaa915 SHA-256: 428c7894c925247e667f36917aa3e91e9e17379d7546d14af600fc8f86a4e57c
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text fragments and URLs that align with an advance-fee scam lure, suggesting the user is prompted to click a link to claim a prize or finalize a transaction. The presence of a malicious redirector URL indicates an attempt to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://ggtraff.ru/strik?keyword=the+deed+has+been+done
    • https://cdn-cms.f-static.net/uploads/4375705/normal_5f98bf92a1b1f.pdf
    • https://cdn-cms.f-static.net/uploads/4388183/normal_5f92640172983.pdf
    • https://cdn-cms.f-static.net/uploads/4366020/normal_5f8e4a3c02477.pdf
    • https://cdn-cms.f-static.net/uploads/4365607/normal_5f8f59eb879b1.pdf
    • https://lasunawinifomun.weebly.com/uploads/1/3/4/3/134385524/87f452b500c1aba.pdf
    • https://cdn-cms.f-static.net/uploads/4368970/normal_5f8f8621dfbd0.pdf
    • https://cdn-cms.f-static.net/uploads/4367271/normal_5f8a578563992.pdf
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/rabodogoju.pdf
    • https://cdn-cms.f-static.net/uploads/4375339/normal_5f945b4a1980e.pdf
    • https://cdn-cms.f-static.net/uploads/4372361/normal_5f953a8a15154.pdf
    • https://nulixedupalaz.weebly.com/uploads/1/3/0/7/130739510/d4f71ba7f239.pdf
    • https://cdn-cms.f-static.net/uploads/4366400/normal_5f9197b213424.pdf
    • https://cdn-cms.f-static.net/uploads/4366348/normal_5f87a3e459f5d.pdf
    • https://bewapuvin.weebly.com/uploads/1/3/1/4/131453684/jigisipejutokege.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/leguvefu/learn_english_through_hindi_in.pdf
    • https://cdn.shopify.com/s/files/1/0500/2647/9769/files/70797555674.pdf
    • https://s3.amazonaws.com/patotale/61306038966.pdf
    • https://cdn.shopify.com/s/files/1/0266/8380/1784/files/rejofi.pdf
    • https://cdn.shopify.com/s/files/1/0502/6214/7225/files/guided_tours_of_england_scotland_and_ireland.pdf
    • https://s3.amazonaws.com/gotenukevepunin/zixugaxigu.pdf
    • https://s3.amazonaws.com/domegagowevag/25490080908.pdf
    • https://cdn.shopify.com/s/files/1/0481/5706/5369/files/53878261592.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_off000065b0.bin
544d2fda4f30c5cf9e52153371ac7647af99c4673565aba0409fe2466372352d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65B0 4872 bytes
font_01_sfnt_off00007634.bin
5c9ce370a32fff8d458f14ac43924e6b60cbd52d2024359fe36cab77b4a6868c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7634 9688 bytes

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