Malicious PDF — malware analysis report

Static analysis result for SHA-256 757dc94159eeb52b…

MALICIOUS

PDF

53.6 KB Created: 2020-09-07 02:41:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1d83c839822206f0d7ea61d3a130389 SHA-1: 513c126a18cecec3c337dc6618b2e6d11b7dd66f SHA-256: 757dc94159eeb52b2fb09ecddcd6342e185696f06ae1153839a3ed781a20bea4
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector infrastructure at 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'enterprise risk management software free' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of a large number of external links also indicates a link farm, likely for SEO poisoning to attract victims.

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=enterprise+risk+management+software+free
    • https://static.usrfiles.com/ugd/dba42a_ace2f69ec40c48d288c0eff6f23abf24.pdf
    • https://static.usrfiles.com/ugd/5360f8_d3c8bfaabb654213bc8b474f711fcea4.pdf
    • https://static.usrfiles.com/ugd/c12414_cbc926bd631841588b3189d1828562d4.pdf
    • https://cdn.shopify.com/s/files/1/0433/6674/4216/files/5099102337.pdf
    • https://cdn.shopify.com/s/files/1/0439/1357/6603/files/difference_between_formation_and_tactics_in_football.pdf
    • https://cdn.shopify.com/s/files/1/0435/7157/6993/files/96055011161.pdf
    • https://cdn.shopify.com/s/files/1/0429/5409/6806/files/gatitorajadekaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/7431/3621/files/volizefi.pdf
    • https://static.usrfiles.com/ugd/affb4a_4f1fa66bc8f04d0099ca52a66f341bad.pdf
    • https://static.usrfiles.com/ugd/b8c837_c4a1241efb154e09aea32844d3733e53.pdf
    • https://static.usrfiles.com/ugd/8ac1ab_ab7673a1e76c4f65a85efb662cf962c7.pdf
    • https://static.usrfiles.com/ugd/5bb01c_20f50b1713f546d4986253d7f6cb1d7d.pdf
    • https://static.usrfiles.com/ugd/4cf28d_1e885967e81644a1a4c7f820a13fcf68.pdf
    • https://cdn.shopify.com/s/files/1/0434/6042/7928/files/gibosusekavewobo.pdf
    • https://cdn.shopify.com/s/files/1/0446/0825/8211/files/ver_peliculas_flv.pdf
    • https://cdn.shopify.com/s/files/1/0440/6044/2774/files/jizeluve.pdf
    • https://cdn.shopify.com/s/files/1/0433/9249/9877/files/98727195068.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_off00009374.bin
e3fcc030245c922bbdca6cde2f489dccc1199d83f48edd5a6f7af9451bd1dcc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9374 5300 bytes
font_01_sfnt_off0000a581.bin
9021ddad6190ce3371bab994cfe48d883c09a05c221578fff5a1843792c6e053		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA581 10492 bytes

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