Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb7237f70e7f1a0…

MALICIOUS

PDF

43.0 KB Created: 2020-08-29 15:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e96c75b09257097dea3065bc0750293f SHA-1: 6a98794640adc1c249a70299ab4a4b163aff7e4b SHA-256: fbb7237f70e7f1a0d9daf42a23cd096dfc0b3ce2c9f8c07612aea66500c6e2b4
154 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by a machine learning classifier and contains a large number of embedded links. One of these links, https://ttraff.com/wix?keyword=sapiens+senai+unidades, points to known malicious redirector infrastructure. The document appears to be a link farm, likely designed to redirect users to malicious sites for phishing or malware delivery.

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.com/wix?keyword=sapiens+senai+unidades
    • https://cdn.shopify.com/s/files/1/0432/9386/8187/files/vawimejusogunozilafi.pdf
    • https://cdn.shopify.com/s/files/1/0435/9992/1315/files/64008848097.pdf
    • https://cdn.shopify.com/s/files/1/0437/5448/7957/files/subject_relative_clauses_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0431/5404/7137/files/1928645573.pdf
    • https://cdn.shopify.com/s/files/1/0436/0149/4179/files/microsoft_certified_azure_fundamentals.pdf
    • https://cdn.shopify.com/s/files/1/0435/7881/8715/files/kawupumufi.pdf
    • https://static.usrfiles.com/ugd/b8c837_e89481e684a14465a2f29f9b678df186.pdf
    • https://static.usrfiles.com/ugd/b8c837_fb8fddfbd9cb4bdda908381a794bc1b6.pdf
    • https://static.usrfiles.com/ugd/b8c837_17a5fc63bfaa451aaf22abc72bd1edbe.pdf
    • https://cdn.shopify.com/s/files/1/0428/2381/1239/files/17539108256.pdf
    • https://cdn.shopify.com/s/files/1/0431/2314/6906/files/ansys_fluent_14._5_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0428/4484/8295/files/95687443482.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_off00006779.bin
546dce289f8001810b072ed0bb51dab3be9d911d4315bfd4608ae118169277ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x6779 4928 bytes
font_01_sfnt_off0000784a.bin
f4cd01a04000e2c864792714f711ca6ee40871da3bba86c0d80b137ebd67078e
pdf-font-stream PDF embedded font (sfnt) at offset 0x784A 12720 bytes