Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ba02b21e9ab66f…

MALICIOUS

PDF

48.5 KB Created: 2020-09-01 18:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c804db23751df3bc8ec15e1fd649397 SHA-1: f79cbdd1b752845c4ae624835a4446d767aa8a4d SHA-256: 81ba02b21e9ab66f08d522500ba7a68757e6c782e1462b12ea80646704162dfe
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'carbon steel pipe grades pdf' and the malicious URL. This suggests a phishing or scam attempt designed to redirect users to malicious content.

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=carbon+steel+pipe+grades+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7900/7398/files/gstreamer_raspberry_pi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3491/8558/files/bomelaguzis.pdf
    • https://cdn.shopify.com/s/files/1/0436/8600/2838/files/pukifawanupowajoxado.pdf
    • https://cdn.shopify.com/s/files/1/0428/1974/7999/files/xefapiwenes.pdf
    • https://static.usrfiles.com/ugd/b8c837_d9aab21f70fa4322b84a1021d7e39212.pdf
    • https://static.usrfiles.com/ugd/b8c837_9076aaec9c194d188f25b10af038e4df.pdf
    • https://cdn.shopify.com/s/files/1/0435/8435/6507/files/53298829756.pdf
    • https://cdn.shopify.com/s/files/1/0433/0799/1208/files/ambience_wav_sound_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/6405/7247/files/nafivuxelepumesofejisu.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_off0000760c.bin
649de30a507ed53f2868e620981c51e692fa831d38ec71bc4aa4ff0591f286d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x760C 5256 bytes
font_01_sfnt_off000087f0.bin
c62483bae95a3bcce77a463b7144f207f731367992a52512330ee414cd4f40da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87F0 14896 bytes

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