Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f1bb125a6b8c584…

MALICIOUS

PDF

38.3 KB Created: 2020-08-30 09:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb5009a7ab6b8ccef4c7c5b9ec88b172 SHA-1: a0e4f28816178c7593442273ecdb6e20faa760d1 SHA-256: 9f1bb125a6b8c584f3719d537824c007d1cf8b8d47fb509f98c59607a14d9c8e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Addends

The PDF was flagged as malicious due to a high number of embedded links, with one specifically pointing to a known malicious redirector. The document body contains garbled text but includes the suspicious URL and a URL to a Shopify-hosted PDF, suggesting a potential link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness.

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=formato+appa+itesm
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/last_shelter_survival_class_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/3690/8439/files/56470831778.pdf
    • https://cdn.shopify.com/s/files/1/0433/2158/9913/files/xawolatujavokipamavo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2243/3953/files/89873620172.pdf
    • https://cdn.shopify.com/s/files/1/0429/9446/6969/files/take_back_your_marriage.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gomejalubewetilukifij.pdf
    • https://static.usrfiles.com/ugd/b8c837_fba2452068a84ca7a8008921feeaa2fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_54a2691d9d394dd08f3885814c2e06d0.pdf
    • https://static.usrfiles.com/ugd/a2c2bc_444fc91152c44d61b11a189bc528e6bf.pdf
    • https://static.usrfiles.com/ugd/760101_cf5667ca8b694566bd62f979ff1ca38e.pdf
    • https://static.usrfiles.com/ugd/82e28d_ca71d106014d4edfac6bfbc248bb1729.pdf
    • https://static.usrfiles.com/ugd/d1c05f_9f0f7d1aeaeb41c582f92910882a7c88.pdf
    • https://static.usrfiles.com/ugd/3bf302_ae5464d7d8324048ad65f3c38d213ccf.pdf
    • https://static.usrfiles.com/ugd/b8c837_2cd2368c0c364fc0b2f561985575212e.pdf
    • https://static.usrfiles.com/ugd/b8c837_5a3ad819ca7040918230151a692985cc.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058dc.bin
434989b2236e7d66d2659f3864d6c8445c4ab73335d6541530e86b61321e93e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x58DC 4888 bytes
font_01_sfnt_off0000695e.bin
14974c8e2c99ec3d9fa83936ba9cc15155e98150cfd63a0e761842d240f50c2a
pdf-font-stream PDF embedded font (sfnt) at offset 0x695E 10304 bytes