Malicious PDF — malware analysis report

Static analysis result for SHA-256 200590aad32dcd17…

MALICIOUS

PDF

49.8 KB Created: 2020-08-23 16:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1967f3a4de98be6b2079ba266c3a1dfa SHA-1: 6c102f4757bd676007c22e075e394dedce96057e SHA-256: 200590aad32dcd17cddee00e65bbc375437ea05748a270fe9b1561d29b3dcfdf
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating a malicious redirector link. The document body, though heavily obfuscated, contains the same malicious URL. The file also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, many of which are benign Shopify links, likely used to mask the malicious redirector. No scripts were extracted from this sample.

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=measurement+of+a+full+size+bed+sheet
    • http://files.us-msminer.net/uploads/1/3/1/1/131164112/savowijimilexoz.pdf
    • https://cdn.shopify.com/s/files/1/0435/4588/6884/files/spivak_category_theory.pdf
    • https://cdn.shopify.com/s/files/1/0433/3414/0072/files/50805746026.pdf
    • https://cdn.shopify.com/s/files/1/0461/9108/3670/files/92389443940.pdf
    • https://cdn.shopify.com/s/files/1/0430/7219/2669/files/capillarity_in_fluid_mechanics.pdf
    • https://cdn.shopify.com/s/files/1/0433/9915/1768/files/gifexegonomonopogolaguvo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kewosa.pdf
    • https://cdn.shopify.com/s/files/1/0443/1344/4508/files/mozenoje.pdf
    • https://cdn.shopify.com/s/files/1/0438/7612/2779/files/bodybuilding_training_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/9378/4728/files/66659684089.pdf
    • https://cdn.shopify.com/s/files/1/0433/7047/9766/files/sample_email_cover_letter_for_job_application.pdf
    • https://cdn.shopify.com/s/files/1/0430/3002/0247/files/ziburonefazaxasukefuwizuj.pdf
    • https://cdn.shopify.com/s/files/1/0448/1653/1617/files/lamakukasi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0239/5813/files/50125571530.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075ec.bin
915a6153fab1a3b49ee3318f5f5f513856c180dd85b9fd69ed2f3475e19f1688
pdf-font-stream PDF embedded font (sfnt) at offset 0x75EC 5224 bytes
font_01_sfnt_off00008782.bin
1fc0b2deffb61a978e49edf8dfe37595719193b9a4148c9407d54f8844774ec2
pdf-font-stream PDF embedded font (sfnt) at offset 0x8782 10600 bytes
font_02_sfnt_off0000abc1.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xABC1 4324 bytes