Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b2a1a514f30f191…

MALICIOUS

PDF

93.1 KB Created: 2020-08-30 15:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b691ce567a7926e615055daf1b2dafa SHA-1: d619ece391cdac5c8bbc317b57c8ca9b4cc78a57 SHA-256: 7b2a1a514f30f191fc523c630296e8e5bd23ad2cc685b06941ded2c45b9b64b3
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a link farm pointing to malicious redirector infrastructure. The primary malicious URL identified is https://ttraff.me/wix?keyword=index+of+bit.+ir+friends, which is likely used to direct users to further malicious content. The ML classifier strongly indicates maliciousness, and the presence of many external links suggests an attempt to distribute or redirect to other malicious sites.

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.me/wix?keyword=index+of+bit.+ir+friends
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/8298/7158/files/butixu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0406/6983/files/begijatelurumisadarud.pdf
    • https://cdn.shopify.com/s/files/1/0440/2623/2997/files/aprendizaje_colaborativo_caracteristicas.pdf
    • https://cdn.shopify.com/s/files/1/0435/6145/1681/files/gozil.pdf
    • https://cdn.shopify.com/s/files/1/0433/7437/9157/files/app_store_for_android_apk.pdf
    • https://static.usrfiles.com/ugd/60933b_f13dc5015b62460a8476bc459f66c693.pdf
    • https://static.usrfiles.com/ugd/b8c837_529951ec6117469db58261daf5e5997e.pdf
    • https://cdn.shopify.com/s/files/1/0432/5385/8472/files/3506230572.pdf
    • https://cdn.shopify.com/s/files/1/0427/8992/9116/files/libro_de_los_mediums_allan_kardec.pdf
    • https://cdn.shopify.com/s/files/1/0434/8523/3304/files/xumowukoxerilakifa.pdf
    • https://static.usrfiles.com/ugd/067ecb_324870bcf68d4fb8bf4214f2e87d04c3.pdf
    • https://static.usrfiles.com/ugd/7baf93_6f744298bd15494bb17b203a873919f2.pdf
    • https://static.usrfiles.com/ugd/902d29_0932f38a5ab74a4d833eb88a5a9cd645.pdf
    • https://static.usrfiles.com/ugd/89363e_24b94509242f41c29dc5f3d62a65e06d.pdf
    • https://static.usrfiles.com/ugd/b8c837_d50a6f3fbc174090b007423b66107f7a.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_off000132c5.bin
17170ec9369dc1baa89f96605a52c44e994acf8dd2a726d1ad75c11fbb2b21b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132C5 4836 bytes
font_01_sfnt_off00014347.bin
33082056119cf4016afe02a4215e75b7f671f6b1aef8af2e2ec96e7021ea52ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14347 10540 bytes

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