Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e9d810e5cc4543c…

MALICIOUS

PDF

35.2 KB Created: 2020-08-03 19:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f9861fbf7751b5708728e93a52bf2fc SHA-1: 698e646a4d2f8ae5502fddcf7b0cf48b83ac8c02 SHA-256: 3e9d810e5cc4543c5e102aa0fb922c8c6069630b15be92326f5ef084ba5cacad
152 Risk Score

Malware Insights

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

The PDF contains a high number of external links, many pointing to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.cc). The document body, though heavily obfuscated, contains the same lure text as the malicious URL, suggesting a phishing attempt. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be a link farm 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.cc/pify?keyword=mathematics+syllabus+d+pdf+download
    • http://files.gatewaychristiancoop.com/uploads/1/3/0/8/130874360/wamorafago.pdf
    • http://files.bartonvillagefestival.com/uploads/1/3/0/7/130775953/8720156.pdf
    • http://files.villamanis.net/uploads/1/3/0/7/130776368/kejoxuzina-jajalabivuto-vamup.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8359/files/32228268811.pdf
    • https://cdn.shopify.com/s/files/1/0432/6224/7067/files/xugawefifef.pdf
    • https://cdn.shopify.com/s/files/1/0432/5674/2046/files/48498013122.pdf
    • https://cdn.shopify.com/s/files/1/0432/2538/3073/files/54023506491.pdf
    • https://cdn.shopify.com/s/files/1/0429/6792/4899/files/29177338521.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9805/files/user_story_mapping.pdf
    • https://cdn.shopify.com/s/files/1/0440/6856/9238/files/rosoxotefixapode.pdf
    • https://cdn.shopify.com/s/files/1/0427/6781/0726/files/20424815836.pdf
    • https://cdn.shopify.com/s/files/1/0435/3510/6200/files/how_to_recover_closed_tabs.pdf
    • https://cdn.shopify.com/s/files/1/0435/4798/4026/files/72006309583.pdf
    • https://cdn.shopify.com/s/files/1/0429/8267/0485/files/89174843867.pdf
    • https://cdn.shopify.com/s/files/1/0431/6427/0743/files/kizexerape.pdf
    • https://cdn.shopify.com/s/files/1/0431/3110/9538/files/rimololepekuruvelabew.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_off00004c2e.bin
641db5799f748d4742be5622308b81acd8e8c9c936de18eebc7539e3c7234256
pdf-font-stream PDF embedded font (sfnt) at offset 0x4C2E 5640 bytes
font_01_sfnt_off00005f59.bin
103975cb2b88a9817154905a002950c8a42864fb01be48288d50567023e607e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F59 9552 bytes