Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d12b858c9b24aa6…

MALICIOUS

PDF

41.4 KB Created: 2020-08-07 13:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 151dd4d8589e3b72801a5c6e11119428 SHA-1: 996aeca4435c8314e3457f86e9679eaa50556a0e SHA-256: 2d12b858c9b24aa6126230ed116f476adafb487ad86f2133376555cf485e89be
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a redirector link to 'ttraff.com'. This suggests the document is designed to lure users to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the presence of a malicious redirector URL is sufficient evidence for a high confidence assessment.

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=middle+cerebral+artery+anatomy+pdf
    • http://files.sagebrushaviation.org/uploads/1/3/1/1/131164009/keretavatakepe.pdf
    • http://files.shadyriverlaporte.org/uploads/1/3/0/7/130776795/9094107.pdf
    • http://files.wmgamebirds.com/uploads/1/3/1/4/131453907/1615128.pdf
    • http://files.bluebarnbbq.com/uploads/1/3/0/7/130740589/bca8965065.pdf
    • https://cdn.shopify.com/s/files/1/0429/5596/4569/files/80903458490.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/37878029996.pdf
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/rumeg.pdf
    • https://cdn.shopify.com/s/files/1/0429/2539/2035/files/14531985053.pdf
    • https://cdn.shopify.com/s/files/1/0431/5149/1233/files/45575753157.pdf
    • https://cdn.shopify.com/s/files/1/0434/0780/2531/files/43633942278.pdf
    • https://cdn.shopify.com/s/files/1/0434/2821/6997/files/38947854986.pdf
    • https://cdn.shopify.com/s/files/1/0429/9328/7321/files/10168669715.pdf
    • https://cdn.shopify.com/s/files/1/0429/8784/7843/files/53849504162.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0664/files/sopuxaxuv.pdf
    • https://cdn.shopify.com/s/files/1/0437/6104/1569/files/takosazetaredasili.pdf
    • https://cdn.shopify.com/s/files/1/0429/7529/7689/files/meroritirefojuzorolu.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8758/files/anemia_chart.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/ramutogixaduvububo.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_off000064b1.bin
c379453c693552e84aa6c64ebdf038688de7a970e741cd560acd6ee62735bf4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x64B1 5372 bytes
font_01_sfnt_off000076f5.bin
536d97bd4a412dd7b1a9e65fa574a9f83611a77340b3e21fae69d2ec30f9b85b
pdf-font-stream PDF embedded font (sfnt) at offset 0x76F5 9720 bytes