Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea0fd932328f2d51…

MALICIOUS

PDF

43.4 KB Created: 2020-09-19 20:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6737831ee989b9ccacd1b5b5b8696cd SHA-1: 3040fa559fc6ef41da5141cd9114e89bb2d65427 SHA-256: ea0fd932328f2d515a2b6d354bfb6bf23d82346e28d4d1c123dbfe69410f78ac
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous external links, many hosted on cdn.shopify.com. The primary malicious URL identified is https://ttraff.me/wix?keyword=skills+worksheet+directed+reading+a+answer+key, which is likely used to lure victims into clicking through to a harmful destination.

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.me/wix?keyword=skills+worksheet+directed+reading+a+answer+key
    • https://cdn.shopify.com/s/files/1/0433/4052/9816/files/gotikosajewemolutoje.pdf
    • https://cdn.shopify.com/s/files/1/0433/8873/1543/files/engineering_graphics_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0438/4194/5760/files/nepetiparemijaxij.pdf
    • https://cdn.shopify.com/s/files/1/0433/4904/9494/files/format_allocation_unit_size_l_g.pdf
    • https://cdn.shopify.com/s/files/1/0432/1758/4285/files/sbi_atm_complaint_form.pdf
    • https://cdn.shopify.com/s/files/1/0432/5651/2676/files/bachianinha_n_1.pdf
    • https://cdn.shopify.com/s/files/1/0482/6503/5938/files/79203743664.pdf
    • https://cdn.shopify.com/s/files/1/0439/6023/8238/files/gunner_s_mate_3rd_class_study_guide.pdf
    • https://97d5a181-57a5-445b-9091-a0549926250c.filesusr.com/ugd/3bca44_797011d4586d485681f08f7505384f73.pdf?index=true
    • https://de7b2020-59a7-421a-9d7a-9593d8550b5f.filesusr.com/ugd/a4c1fa_a0f46b9540824de19b7a0ea4819592be.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0433/4659/1903/files/84561316362.pdf
    • https://cdn.shopify.com/s/files/1/0462/0058/6398/files/lafeloli.pdf
    • https://cdn.shopify.com/s/files/1/0462/3853/1738/files/nupeniwedunijexonezaf.pdf
    • https://cdn.shopify.com/s/files/1/0434/4987/6630/files/modal_verbs_of_obligation_exercise_p.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_off000069ae.bin
9d92906384a358fc41f5df19a90faef61e30f2b9adcaa4af14a93355b0bb174d
pdf-font-stream PDF embedded font (sfnt) at offset 0x69AE 5560 bytes
font_01_sfnt_off00007ca7.bin
a5c55b6ba2b1ad6a9368e85e50c30b550ae0622aee98ea51c851fc0a54415388
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CA7 10536 bytes