Malicious PDF — malware analysis report

Static analysis result for SHA-256 833cd5ad0bb876dc…

MALICIOUS

PDF

36.7 KB Created: 2020-08-10 23:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 055dcd23ae6f8f57d4984eb17f3ca2db SHA-1: b7950925323941991693d3ef472461030de3d8db SHA-256: 833cd5ad0bb876dce98da78cca76dd2413fbdfa05f44dabb380a9f991c6678f1
150 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 characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be luring the user to the 'ttraff.com' redirector.

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.com/pify?keyword=academy+stars+5+pdf
    • http://files.gatewaybruins.com/uploads/1/3/1/0/131071312/razom.pdf
    • http://files.ess-inc.com/uploads/1/3/2/3/132303229/goturisipure.pdf
    • http://files.estellessweetitchblankets.com/uploads/1/3/1/4/131409170/tixavaxanepuluxuvit.pdf
    • https://cdn.shopify.com/s/files/1/0432/8092/4840/files/zeboxuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/36103472339.pdf
    • https://cdn.shopify.com/s/files/1/0434/4155/3575/files/cengage_physical_chemistry_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kuzizurogepibisomagin.pdf
    • https://cdn.shopify.com/s/files/1/0431/7642/7686/files/interview_questions_for_cabin_crew.pdf
    • https://cdn.shopify.com/s/files/1/0437/5206/3125/files/path_of_exile_ranger_build_beginner.pdf
    • https://cdn.shopify.com/s/files/1/0435/6515/4463/files/how_to_push_a_file_to_github.pdf
    • https://cdn.shopify.com/s/files/1/0435/1646/1211/files/rpsc_steno_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0452/3737/1037/files/programming_abstractions_in_c_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/4931/9577/files/bombay_blood_group_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/3469/6097/files/acidosis_metabolica_con_anion_gap_normal.pdf
    • https://cdn.shopify.com/s/files/1/0434/3745/7574/files/lijakirar.pdf
    • https://cdn.shopify.com/s/files/1/0439/0138/6920/files/94229958153.pdf
    • https://cdn.shopify.com/s/files/1/0429/5573/5193/files/canadian_citizen_application_form.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_off000050ac.bin
bf38962f63fc7e00cd827fd27b0c1dfd98ea5674068b72bad7828034a2fa6f00
pdf-font-stream PDF embedded font (sfnt) at offset 0x50AC 5484 bytes
font_01_sfnt_off0000634b.bin
f263122e92c16abcf83f2090a2d62724df746cc951ed33549af9c9038051f8e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x634B 10212 bytes