Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34433e333e208bd…

MALICIOUS

PDF

49.9 KB Created: 2020-08-19 20:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c999bfd123d6f5d6c96247ba22866c5 SHA-1: f87f0aef513872032983c3dd6f3ca1b1bb06dd71 SHA-256: a34433e333e208bd361ca1b51ec5280f2fcd0cdc87e51724628abd7f483b820e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a document about anticonvulsants. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the malicious URL and appears to be generated by wkhtmltopdf, a tool often used to create malicious PDFs. The presence of numerous external links, many pointing to Shopify, suggests a link farm or SEO poisoning tactic to distribute the 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/pify?keyword=mecanismo+de+accion+de+anticonvulsivantes.+pdf
    • http://files.hepworthnewquaycornwall.com/uploads/1/3/1/3/131380052/bebigufixosesov_ripumifaj_nutevulujonasuk.pdf
    • http://rumawawav.cuddlesforclefts.com/uploads/1/3/0/7/130740025/6827567.pdf
    • https://cdn.shopify.com/s/files/1/0429/6356/6755/files/58611005412.pdf
    • https://cdn.shopify.com/s/files/1/0430/2084/5210/files/hyster_50_forklift_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/9821/7374/files/jaxufapafajo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9702/2879/files/nabojidamaxekuwizamisira.pdf
    • https://cdn.shopify.com/s/files/1/0435/6970/9217/files/sebunorumuwusiwunazidu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8715/0752/files/80262833944.pdf
    • https://cdn.shopify.com/s/files/1/0437/9069/6597/files/61217136548.pdf
    • https://cdn.shopify.com/s/files/1/0434/3899/7669/files/69375368176.pdf
    • https://cdn.shopify.com/s/files/1/0433/9322/0758/files/19657245305.pdf
    • https://cdn.shopify.com/s/files/1/0433/3119/0952/files/map_dispatch_to_props.pdf
    • https://cdn.shopify.com/s/files/1/0434/6239/4021/files/22177219645.pdf
    • https://cdn.shopify.com/s/files/1/0428/8941/2764/files/xewabikamivumepuve.pdf
    • https://cdn.shopify.com/s/files/1/0431/3645/0717/files/cours_vba_excel_2020_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0428/1368/5927/files/37214713254.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/
    • https://cdn.shopify.com/s/files/1/0428/8941/2764/files/x

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000829d.bin
31c5a306f8e99fc2d1899603e27a249eef37436a94219731ddc35a487e31ca36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x829D 5304 bytes
font_01_sfnt_off000094a7.bin
68d34914dbf484cc263c65d6a1a592a75e8a53aa5137dde3a15f953f75eeccfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94A7 10912 bytes

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