Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c7164412d22164f…

MALICIOUS

PDF

41.1 KB Created: 2020-09-01 14:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c771e66fba2cd2375fb4bbbdd7a1a1d SHA-1: ef88b25de3533120ab144fef525e4e36f2ef9641 SHA-256: 7c7164412d22164f184399bdf983df360319195b30a9bbadef243146d7a6cecb
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous Shopify-hosted PDF files, with one primary link redirecting to a malicious domain. This suggests a tactic to obscure malicious links or to distribute further content. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs confirms the intent to redirect users. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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/wix?keyword=marathi+balgeet+video++mp4
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6568/7717/files/62094085546.pdf
    • https://cdn.shopify.com/s/files/1/0428/3976/9254/files/effective_business_report_writing.pdf
    • https://cdn.shopify.com/s/files/1/0431/8524/2276/files/delukitifomogirifado.pdf
    • https://cdn.shopify.com/s/files/1/0437/3915/2535/files/63173983250.pdf
    • https://cdn.shopify.com/s/files/1/0431/1564/3031/files/45061821004.pdf
    • https://cdn.shopify.com/s/files/1/0434/3624/5142/files/dudakujumikavobojup.pdf
    • https://cdn.shopify.com/s/files/1/0431/7108/6492/files/ridijex.pdf
    • https://cdn.shopify.com/s/files/1/0438/4056/9494/files/95715165654.pdf
    • https://cdn.shopify.com/s/files/1/0429/1556/1638/files/fevawamasitazuxix.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3852/files/6966359249.pdf
    • https://cdn.shopify.com/s/files/1/0436/3039/5552/files/differential_calculus_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/9279/4774/files/volume_and_surface_area_of_compound_shapes_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0435/1537/9880/files/qau_admission_form_2018.pdf
    • https://cdn.shopify.com/s/files/1/0429/4829/6857/files/giwobukozen.pdf
    • https://cdn.shopify.com/s/files/1/0435/1921/3727/files/mezugonatatifijaruxorudur.pdf
    • https://cdn.shopify.com/s/files/1/0429/7333/1609/files/65685666017.pdf
    • https://cdn.shopify.com/s/files/1/0437/7663/9127/files/mcdonalds_coupons_july_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/7678/8134/files/virerumupana.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_off000061d5.bin
396a82bd9fce60252a4ec026df351d042f15ee60fee4565f41bc4b0851125828		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61D5 5488 bytes
font_01_sfnt_off00007469.bin
aa1f53256b681dae127dffc104fbe96e2c76af5aae94001d9b2aa1b0df8ef675		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7469 10216 bytes

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