Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e95dae5af157d6…

MALICIOUS

PDF

47.2 KB Created: 2020-08-30 18:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 421e7863191f1e6e44a8c67adf476525 SHA-1: 60ab3cd373b59424cf00f65eaa39d6a559791dfe SHA-256: 71e95dae5af157d629dfbe34e1f69d5a0f9918f6791e1ee449a961fad87146ad
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains embedded links, one of which, 'https://ttraff.cc/wix?keyword=coulomb+s+law+physics+classroom+answers', is identified as a malicious redirector. The document also features a large number of links to PDFs hosted on Shopify, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lure users to malicious infrastructure.

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/wix?keyword=coulomb+s+law+physics+classroom+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0445/6588/9188/files/warsan_shire_home.pdf
    • https://cdn.shopify.com/s/files/1/0439/5650/2686/files/dimuxemila.pdf
    • https://cdn.shopify.com/s/files/1/0435/5158/8507/files/23841097378.pdf
    • https://cdn.shopify.com/s/files/1/0430/6557/3537/files/neet_chemistry_syllabus_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/0182/2875/files/pawprints_left_by_you.pdf
    • https://cdn.shopify.com/s/files/1/0461/6752/3491/files/dovozijaduwejimipipo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9240/files/posujedapegemuwekuzozogu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9749/6483/files/gisatekelokunixafi.pdf
    • https://cdn.shopify.com/s/files/1/0437/9970/7805/files/28004280326.pdf
    • https://cdn.shopify.com/s/files/1/0429/9728/5027/files/wowotabapowegamepile.pdf
    • https://static.usrfiles.com/ugd/45e30f_db2dbcc7547844658c529d303814e4ad.pdf
    • https://static.usrfiles.com/ugd/b8c837_207b4d899bf84769bf205cc39dfc9b4f.pdf
    • https://static.usrfiles.com/ugd/b8c837_7450f0a71b8442cc90548803a306cbe0.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000791b.bin
483a51a081b2cf6c1ce42d8b21a61f205bb0b376509831f8c609e7d7f805e214
pdf-font-stream PDF embedded font (sfnt) at offset 0x791B 5412 bytes
font_01_sfnt_off00008b71.bin
bd43c88bcbb38ecfb660f9acad487fa2b959496053bc3512386c0dedceee9ec8
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B71 10772 bytes