Malicious PDF — malware analysis report

Static analysis result for SHA-256 b75308cac9f12339…

MALICIOUS

PDF

48.4 KB Created: 2020-08-30 11:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d78a18280664fdee098ca72280d28c20 SHA-1: a684a4ba5b552f9493225ca683c5263f3218d9b6 SHA-256: b75308cac9f12339d78f1427d7303f4b182756e527eaea6312a20b976e395279
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits a PDF link farm heuristic, with numerous links pointing to PDFs hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern appears to be the distribution of a link farm, potentially for SEO manipulation or to lure users to malicious sites.

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/wix?keyword=htc+one+vx+review
    • https://cdn.shopify.com/s/files/1/0430/9726/0192/files/93188325552.pdf
    • https://cdn.shopify.com/s/files/1/0440/8714/8694/files/33769161547.pdf
    • https://cdn.shopify.com/s/files/1/0432/9229/5333/files/vubenig.pdf
    • https://cdn.shopify.com/s/files/1/0434/3375/4780/files/botulismo_em_bovinos.pdf
    • https://cdn.shopify.com/s/files/1/0434/1373/3533/files/gapepupo.pdf
    • https://cdn.shopify.com/s/files/1/0437/5969/8077/files/ravawedu.pdf
    • https://cdn.shopify.com/s/files/1/0457/5907/0372/files/offshore_fishing_report_florida_keys.pdf
    • https://cdn.shopify.com/s/files/1/0448/9386/4091/files/junior_ii_bauer_compressor_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/0199/3622/files/35712668391.pdf
    • https://cdn.shopify.com/s/files/1/0432/6375/4404/files/73113954023.pdf
    • https://cdn.shopify.com/s/files/1/0432/2590/7368/files/63945230748.pdf
    • https://cdn.shopify.com/s/files/1/0461/8328/4890/files/zifonabawudefagowiluzew.pdf
    • https://cdn.shopify.com/s/files/1/0433/2106/5640/files/irs_donation_value_guide_2015.pdf
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/numbers_in_words_1_to_100_download.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_off0000813f.bin
3b1b90161b8b175c48ea17c18a736bbbc952cba3ef3ae012db9588bd79ade624
pdf-font-stream PDF embedded font (sfnt) at offset 0x813F 4552 bytes
font_01_sfnt_off000090d5.bin
cfad196190a5c297870933117f2cfc7eac64667140ae30563737edb737506d31
pdf-font-stream PDF embedded font (sfnt) at offset 0x90D5 10608 bytes