Malicious PDF — malware analysis report

Static analysis result for SHA-256 273bb506a4cde1b5…

MALICIOUS

PDF

45.8 KB Created: 2020-08-08 23:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3d55165dfac6e45a40631317f5ae6db SHA-1: f8accb05c98ed661476bfdbc4fe644b56fc1b3f2 SHA-256: 273bb506a4cde1b5a549b39be9b746af67c69aa77126e5d04a2991412c5b39fa
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to ttraff.cc. The document body, though heavily obfuscated, contains the same URL and a reference to a vocal score PDF, suggesting a lure. The PDF also contains a large number of external links, many hosted on Shopify, which is indicative of a link farm used for SEO poisoning or distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=ascanio+in+alba+vocal+score+pdf
    • http://files.actonindoortennisbubble.com/uploads/1/3/2/7/132740264/e8039.pdf
    • http://tevokuba.techedlearning.com/uploads/1/3/1/4/131410007/zedok.pdf
    • http://files.schaferblog.com/uploads/1/3/0/9/130969352/xukekowuxovozidurawe.pdf
    • http://files.ontargetpaintball.com/uploads/1/3/1/6/131606343/29f77da.pdf
    • http://files.thislittlepiggyminis.com/uploads/1/3/2/8/132814306/wotipakixodolu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7664/9124/files/90319358066.pdf
    • https://cdn.shopify.com/s/files/1/0441/4147/8040/files/95779367222.pdf
    • https://cdn.shopify.com/s/files/1/0431/8806/0321/files/business_model_you_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/3438/5303/files/ap_module_grade_9_teacher_s_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/4104/6171/files/wakadepuduwu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4956/6886/files/tijuki.pdf
    • https://cdn.shopify.com/s/files/1/0431/1308/7142/files/nufeja.pdf
    • https://cdn.shopify.com/s/files/1/0430/4958/2743/files/famexibo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0933/4683/files/automatic_door_opening_and_closing_system_project.pdf
    • https://cdn.shopify.com/s/files/1/0444/0326/1606/files/awaken_the_giant_within_anthony_robbins.pdf
    • https://cdn.shopify.com/s/files/1/0431/8491/4583/files/86642926929.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/38324994820.pdf
    • https://cdn.shopify.com/s/files/1/0431/5181/8903/files/mercedes_benz_a160_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/9690/6659/files/audacity_2._3._0_manual.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_off00006de1.bin
36dd917837202a4ed72c66f5730b112cad02020d60c46308e0111df93042100d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE1 5340 bytes
font_01_sfnt_off0000801c.bin
652a8034c16a9fae87caeb12b24e697ca2e2003b33b505783768b55f4627b3da
pdf-font-stream PDF embedded font (sfnt) at offset 0x801C 13620 bytes