Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b0104875c64a1a1…

MALICIOUS

PDF

41.1 KB Created: 2020-08-30 22:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5091272e50b5fd8455a01203c9ecbf9 SHA-1: b0155523ecedc46a4ea6a48f85d14c45c66a5887 SHA-256: 7b0104875c64a1a159d34aba45a6b52ab8274dee0cb0a15522caa8706408fb35
154 Risk Score

Malware Insights

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

This PDF file was identified as malicious by an ML classifier and contains a link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL and appears to be a lure for users interested in reading strategies. The presence of numerous external PDF links suggests a link farm or SEO manipulation tactic. No scripts were extracted, but the PDF structure itself facilitates the 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.ru/wix?keyword=avid+critical+reading+strategies
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/76156b_8cd49b6595564b05997a8eba6daffd66.pdf
    • https://static.usrfiles.com/ugd/b8c837_ffc0bdad52cc469999d2b6e070ec88c8.pdf
    • https://static.usrfiles.com/ugd/ae15ca_4029e7b6be68475aa2e834a7768602cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_f25449f8f3d245d2bead0c1867bef2d9.pdf
    • https://static.usrfiles.com/ugd/2b3f46_7743a0f517304eb380bf5c7df7cb09b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_b19415cbbbb84587b00bd428bcd33622.pdf
    • https://static.usrfiles.com/ugd/2ca09c_56f907fa06dd415d8d98ce9dacbc28c0.pdf
    • https://static.usrfiles.com/ugd/48d9a1_c2d8ba1adf5644589881623e7dac463d.pdf
    • https://cdn.shopify.com/s/files/1/0440/8731/2534/files/microsoft_word_travel_brochure_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/4525/6352/files/punuvu.pdf
    • https://cdn.shopify.com/s/files/1/0440/7640/0792/files/wumoxabamuboloz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/52876055892.pdf
    • https://static.usrfiles.com/ugd/b8c837_7018903051f044beb3f1af54db9e7b8c.pdf
    • https://static.usrfiles.com/ugd/c0b427_7ecc069dc1cf42c9b1677e89dfc0a8dd.pdf
    • https://static.usrfiles.com/ugd/b7082a_8a2b7822f3f643d6ae05b2b6c027cfd4.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_off000063e4.bin
76cb9a0f20ec1aacb33b7625a86df5e8df001a1fa566798b58cb75c8f71b99bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x63E4 5156 bytes
font_01_sfnt_off0000757d.bin
c067e466c0f64cc22e8fea50e5ff02694b71acd9aea36d30cf38cb0ebca9f19a
pdf-font-stream PDF embedded font (sfnt) at offset 0x757D 10076 bytes