Malicious PDF — malware analysis report

Static analysis result for SHA-256 75d3f6c9956f719a…

MALICIOUS

PDF

45.6 KB Created: 2020-08-26 05:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46deed1554bd217a1e7d15d8ebcc482d SHA-1: d8fb3d2b17c4c31c36e6cb410f2a41cc3adf15e9 SHA-256: 75d3f6c9956f719a1f7a2b7acb0622a8d068412ca48062704886c11bef0e7cb2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the critical heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains a URL that points to a known redirector. The presence of numerous external PDF links further supports the malicious intent of directing users to potentially harmful sites.

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.com/pify?keyword=william+carlos+williams+use+of+force
    • http://zisipabe.chundenver.org/uploads/1/3/2/7/132712572/renakazef.pdf
    • http://files.drcarterscourses.org/uploads/1/3/0/8/130813330/328bc48b8d81.pdf
    • http://files.clairemcgee.com/uploads/1/3/0/7/130775023/5759617.pdf
    • http://luzer.gruverstreefarm.com/uploads/1/3/1/6/131606727/muzubesegekejubisexa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6700/7386/files/incremental_sheet_metal_forming.pdf
    • https://cdn.shopify.com/s/files/1/0434/4633/7703/files/lebef.pdf
    • https://cdn.shopify.com/s/files/1/0432/5018/8443/files/97777895394.pdf
    • https://cdn.shopify.com/s/files/1/0427/8226/1415/files/sisagipomovojutidoz.pdf
    • https://cdn.shopify.com/s/files/1/0429/1634/8057/files/57800195701.pdf
    • https://cdn.shopify.com/s/files/1/0432/5317/0339/files/rowujomadesofi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1767/4656/files/mapa_mundi_para_pintar.pdf
    • https://cdn.shopify.com/s/files/1/0433/2807/7992/files/tinaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/watch_my_sassy_girl_movie_online_wit.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_off00007627.bin
d393c25a73a26f69100eb001b0b497899f627e675643ef35d9c8a84af7e5fb7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7627 5132 bytes
font_01_sfnt_off00008796.bin
d072c0e1aaa30845d8b6d3574651cb988d573f5352999cc86319e4c5c35782df
pdf-font-stream PDF embedded font (sfnt) at offset 0x8796 9920 bytes