Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f76fc930976808…

MALICIOUS

PDF

35.0 KB Created: 2020-09-04 02:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3669bb30a04c3c91f3d382b1b3ab0f30 SHA-1: 3a0417a695bc34ffbaedfd315f9fb7914fc18224 SHA-256: 86f76fc930976808c5435ed6b1b71787a45d6cb906260301d30bdc833f75f2d3
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as a coloring sheet. The document body and embedded URLs suggest a lure to a malicious site, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, leveraging a common social engineering tactic.

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=jesus+walks+on+water+coloring+sheet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_8fba20c10aed4626bec197012fb0036f.pdf
    • https://static.usrfiles.com/ugd/b8c837_40427c1de91b472eb12c545b3c415cf4.pdf
    • https://static.usrfiles.com/ugd/b8c837_84efde7250314dec8f068c642ff89482.pdf
    • https://static.usrfiles.com/ugd/dd4472_62b3d20665194c969e5c89f67837d67a.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/49221060197.pdf
    • https://cdn.shopify.com/s/files/1/0434/5102/3510/files/menigal.pdf
    • https://cdn.shopify.com/s/files/1/0431/3825/2957/files/anticonvulsivantes_mecanismo_de_accion.pdf
    • https://cdn.shopify.com/s/files/1/0428/0965/5462/files/80073485432.pdf
    • https://cdn.shopify.com/s/files/1/0465/5097/4614/files/english_for_everyone_practice_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/4614/9023/files/believer_tamil_version_masstamilan.pdf
    • https://cdn.shopify.com/s/files/1/0438/0069/0848/files/academic_performance_of_students_with_absentee_parents.pdf
    • https://cdn.shopify.com/s/files/1/0429/9302/5187/files/65816867452.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/bulufi.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_off00004aa4.bin
4dc9cf906b6c00e41339111b511123c0d0aa0145428421cb743631ac80a05d79
pdf-font-stream PDF embedded font (sfnt) at offset 0x4AA4 5204 bytes
font_01_sfnt_off00005c62.bin
ba3e132b25a7a41c5cbbeb2059b24a5e60be446b5fa2bc0ad5af394c3c3bb0ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C62 10224 bytes