Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83ef7e73d9b6cad…

MALICIOUS

PDF

53.7 KB Created: 2020-08-29 19:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c53af08a67cd94fc0cd51dd54831273e SHA-1: 7190eef331cb5c018d4a69414f0bfd74d88238ac SHA-256: b83ef7e73d9b6cad58fb7c6b0e2ee11fb439ebbe85e0a4a1d9e0372f87af4a60
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a document about 'Hindi typing keyboard format pdf'. This link, 'https://ttraff.cc/wix?keyword=hindi+typing+keyboard+format+pdf', leads to known malicious infrastructure. The document also contains a large number of embedded links to external PDFs, many of which point to 'static.usrfiles.com', suggesting a link farm or SEO poisoning tactic to distribute the malicious content. The ML classifier strongly indicated maliciousness.

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=hindi+typing+keyboard+format+pdf
    • https://static.usrfiles.com/ugd/01e791_f846f0a5e7b54f3d84616640fa84242e.pdf
    • https://static.usrfiles.com/ugd/b8c837_aef4a56c6d534256a526c5e6a576f322.pdf
    • https://static.usrfiles.com/ugd/b8c837_afd93b34cf5044dc8fdf7ef74441fcd7.pdf
    • https://static.usrfiles.com/ugd/c3f88d_7046f9fc86c3401aa702d626ef684c7f.pdf
    • https://static.usrfiles.com/ugd/b8c837_0b4d2f54a45f4482b425ffd9f1605dfa.pdf
    • https://static.usrfiles.com/ugd/b8c837_60c17328f75a464194b36c3c57eb641e.pdf
    • https://static.usrfiles.com/ugd/b8c837_4263e917e5ab430bbce7e8548f6d2abe.pdf
    • https://static.usrfiles.com/ugd/b8c837_52f7ffbc28aa468598dd2add4698cb5d.pdf
    • https://static.usrfiles.com/ugd/b8c837_20120a4b11384d389bb93c1fe5809df7.pdf
    • https://cdn.shopify.com/s/files/1/0432/4265/1816/files/muwulapiwovevufesib.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/danedogorolulefumatexa.pdf
    • https://cdn.shopify.com/s/files/1/0432/6031/3763/files/1308054459.pdf
    • https://cdn.shopify.com/s/files/1/0435/4405/1871/files/truth_and_reconciliation_commission_canada_report.pdf
    • https://cdn.shopify.com/s/files/1/0431/2704/6298/files/bogaretusatosibafevirex.pdf
    • https://cdn.shopify.com/s/files/1/0443/2723/9836/files/attractive_man_cheat_sheet.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a53.bin
a34bced2ac5240e695f903216a1a67c219c46bf42eea86dd145b79b55efd6af8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A53 5420 bytes
font_01_sfnt_off00007ca6.bin
a7c194c348f4bc26aad06ae1fa1eadf76503a3aca856ff80314c3d87a816eea9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CA6 3720 bytes
font_02_sfnt_off00008806.bin
7a5a9fc60d3fd1bf6da27de00e90ea3889d2d0234ccc037e3ae08fbdd2f2bc39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8806 10236 bytes
font_03_sfnt_off0000ab44.bin
1abc79b418aa6dda9d97d3bc1c7529bcd8aabb1f7984abeb6af652e154aca882		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB44 8904 bytes

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