Malicious PDF — malware analysis report

Static analysis result for SHA-256 81287c132b206362…

MALICIOUS

PDF

39.0 KB Created: 2020-08-23 06:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a1f4b64cdac8fcfd429b0f457b6ee19 SHA-1: 35941ced061bb89d7bb1525ed9183374f3935161 SHA-256: 81287c132b20636268e3d6d36b84d2196b45e6d23a36659d907cb0b145e45354
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to trick the user into clicking it. The presence of numerous other PDF links, many hosted on Shopify, indicates a potential link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious.

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=act+irregularity+report+form
    • http://maginan.rogeraldridge.com/uploads/1/3/0/7/130739994/xapop.pdf
    • http://files.oakhillsoregon.com/uploads/1/3/1/3/131378942/5083474.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8933/0325/files/29190646378.pdf
    • https://cdn.shopify.com/s/files/1/0432/3531/1784/files/visibimogusivusukozij.pdf
    • https://cdn.shopify.com/s/files/1/0429/2640/7833/files/degogusepoluje.pdf
    • https://cdn.shopify.com/s/files/1/0445/6490/6148/files/artificer_apprentice_question_paper_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9206/files/99957528079.pdf
    • https://cdn.shopify.com/s/files/1/0434/6209/9097/files/9276061534.pdf
    • https://cdn.shopify.com/s/files/1/0436/5923/1385/files/interpretacion_de_una_biometria_hematica_completa.pdf
    • https://cdn.shopify.com/s/files/1/0431/5820/8672/files/26855828136.pdf
    • https://cdn.shopify.com/s/files/1/0438/6239/2992/files/71612543654.pdf
    • https://cdn.shopify.com/s/files/1/0431/2625/9876/files/73207288682.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_off00005a7b.bin
e9131eea7d700b47f123a79b6ff6f1e47afc0b234855e7d91367d8a68e741eae
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A7B 5248 bytes
font_01_sfnt_off00006c49.bin
a9219bac6c8245a8ab5ac8309b50e59d18eda5c7dafaaa24d2cdad0e23c7cc8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C49 10328 bytes