Malicious PDF — malware analysis report

Static analysis result for SHA-256 3924a937588e122c…

MALICIOUS

PDF

35.9 KB Created: 2020-08-11 03:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de8685722bfcdcbeb31327349840a942 SHA-1: 76b6f7ed96032d15f836ba861edf48c0e1960959 SHA-256: 3924a937588e122c2d0d95971fb1dc60fc28d473511174f444ae46cf69e2c552
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lead users to further malicious content. The document also hosts a large number of external PDF links, many pointing to Shopify domains, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness, and the embedded URL heuristic confirms the presence of links within the document body.

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=bridge+over+troubled+water+guitar+pdf
    • http://files.ckmsband.org/uploads/1/3/1/3/131380008/kitaxexukonoxus-kiralizone-donoda-zijinenan.pdf
    • http://files.savesaintthomasschool.com/uploads/1/3/2/6/132695813/3101381.pdf
    • http://files.simplicityclothing2.com/uploads/1/3/0/7/130776757/mawab.pdf
    • https://cdn.shopify.com/s/files/1/0431/5935/5556/files/76465282798.pdf
    • https://cdn.shopify.com/s/files/1/0433/8686/3783/files/93197364879.pdf
    • https://cdn.shopify.com/s/files/1/0432/9170/5500/files/sugonoramu.pdf
    • https://cdn.shopify.com/s/files/1/0440/4301/0213/files/antiviral_drugs.pdf
    • https://cdn.shopify.com/s/files/1/0434/0498/4483/files/97894325925.pdf
    • https://cdn.shopify.com/s/files/1/0428/3564/0476/files/kewuniloti.pdf
    • https://cdn.shopify.com/s/files/1/0440/1371/5606/files/calicut_university_bsc_computer_science_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/hot_rod_frame_plans.pdf
    • https://cdn.shopify.com/s/files/1/0430/5852/8405/files/5338755763.pdf
    • https://cdn.shopify.com/s/files/1/0429/1582/3772/files/jubalewifit.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_off000047d7.bin
110bbbf83a52fb99699d0540ea7e8c814ec9ec1aebc1ccd099cfba7f143284ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x47D7 5372 bytes
font_01_sfnt_off00005a43.bin
9c810f94cd05475667dc6b4d51f56d78da56c4791fe6f8e53ec8cef3161de250
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A43 12788 bytes