Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d9c5aa4f428bc8…

MALICIOUS

PDF

45.0 KB Created: 2020-08-29 20:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2efacde04c7719bdef4c0752d60069a2 SHA-1: cfd291633c651aab7f0751555339ea03c19a9bc4 SHA-256: b9d9c5aa4f428bc8b521886638ecadc1ad56d118e8e780b5111351764d3aa308
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by a machine learning classifier and contains a significant number of embedded links. One of these links, 'https://ttraff.cc/wix?keyword=biomagnetismo+holistico+celular', points to known malicious redirector infrastructure. The file also exhibits characteristics of a PDF link farm, with numerous external links, suggesting a potential SEO manipulation or phishing attempt.

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=biomagnetismo+holistico+celular
    • https://static.usrfiles.com/ugd/b8c837_4c523a31869c47538eeaff3ab465aa72.pdf
    • https://static.usrfiles.com/ugd/ce14f3_31cff01af9fa4a378b27680d0b2f0787.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f942ffbf94a42d18c802cc273553ebc.pdf
    • https://static.usrfiles.com/ugd/c7a620_19b3ab5d06084060829d5cdf48b46954.pdf
    • https://static.usrfiles.com/ugd/b8c837_ee0f358b04a9480d818a34294fcb97e5.pdf
    • https://static.usrfiles.com/ugd/b8c837_91bd76de3e76456eaec83261e4df3258.pdf
    • https://static.usrfiles.com/ugd/b8c837_fc8c2cb50eb44ad7bc8a04a14cb559bd.pdf
    • https://cdn.shopify.com/s/files/1/0434/6760/4128/files/13680997792.pdf
    • https://cdn.shopify.com/s/files/1/0437/3495/8229/files/the_trove_acquisitions_incorporated.pdf
    • https://cdn.shopify.com/s/files/1/0433/3505/7559/files/konasomogewomexu.pdf
    • https://static.usrfiles.com/ugd/b8c837_fae4bc71b46c44b0aae9655d242d7e39.pdf
    • https://static.usrfiles.com/ugd/b8c837_6a08c401915e4bd18991ef63afac1668.pdf
    • https://static.usrfiles.com/ugd/b8c837_9ae2d4fe74bf4c39881237cd88316d42.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7a1767b0ebf4c67a7d7807bdf1b2781.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_off00007276.bin
ec3a7f56be348f7f82471f07b18cc01622bdc41159cba921a287ab2231d44d95
pdf-font-stream PDF embedded font (sfnt) at offset 0x7276 5264 bytes
font_01_sfnt_off00008426.bin
576b154e501def8f1dcaf89dc789c658ffcef85fca566502886b387cbd7a7d62
pdf-font-stream PDF embedded font (sfnt) at offset 0x8426 10304 bytes