Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83a0cd21e42ce1a…

MALICIOUS

PDF

46.6 KB Created: 2020-08-11 23:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7ea8a690ba9cfcfa4ba7401314ddf95 SHA-1: 28b03f08af8e967ba8bba90d371494d8e27911b9 SHA-256: b83a0cd21e42ce1a53e238246d542bed6910cda6661b8538c66a611c563111b7
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic, suggesting the primary goal is to lure the user to a malicious site.

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=regimento+da+assembleia+nacional+popular+da+guine+bissau+pdf
    • http://rofama.macarthursaintsjrlfc.com/uploads/1/3/1/6/131636855/2272674.pdf
    • http://files.vk5pas.com/uploads/1/3/0/7/130739895/e9f4fe52ce.pdf
    • http://files.spice-grind.com/uploads/1/3/1/4/131453354/sisiluxedifoboxuget.pdf
    • https://cdn.shopify.com/s/files/1/0433/3453/3275/files/jubimitazediloke.pdf
    • https://cdn.shopify.com/s/files/1/0427/8488/2844/files/56765635156.pdf
    • https://cdn.shopify.com/s/files/1/0431/5935/5558/files/36398502802.pdf
    • https://cdn.shopify.com/s/files/1/0432/1991/0811/files/70535191639.pdf
    • https://cdn.shopify.com/s/files/1/0432/8721/6293/files/69236386462.pdf
    • https://cdn.shopify.com/s/files/1/0427/7246/3772/files/90360934553.pdf
    • https://cdn.shopify.com/s/files/1/0435/0499/2408/files/57125927936.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/95936092566.pdf
    • https://cdn.shopify.com/s/files/1/0434/2795/4854/files/ultra_boom_shroom.pdf
    • https://cdn.shopify.com/s/files/1/0428/6827/7415/files/83222255629.pdf
    • https://cdn.shopify.com/s/files/1/0431/9703/8756/files/xozujiviv.pdf
    • https://cdn.shopify.com/s/files/1/0428/6047/8630/files/73590611706.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_off000071c0.bin
f5658716a4c31baa45c3df0f724116c6b73584cc39c91c5157708cf5c33f36ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x71C0 5620 bytes
font_01_sfnt_off000084c4.bin
2078a7a2ad3bca97d798fcabb076b6991e62f17068772c19d540b198d002f377
pdf-font-stream PDF embedded font (sfnt) at offset 0x84C4 12616 bytes