Malicious PDF — malware analysis report

Static analysis result for SHA-256 166da3bbbbf6dd2a…

MALICIOUS

PDF

43.9 KB Created: 2020-08-04 20:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 780db800de96f22b448cfa19c85c8029 SHA-1: 35937aa97393209fc8ab2725bd2cfd82f8edc7ab SHA-256: 166da3bbbbf6dd2a441ec9cb9e5787c124f824e788bc913f31f953f8e0d1812c
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, including a known malicious redirector. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest a link farm or SEO poisoning tactic to drive traffic to malicious sites. No scripts were extracted, but the PDF structure itself is weaponized to host and distribute links.

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=phonemic+awareness+definition+pdf
    • http://files.scrappingfairy.net/uploads/1/3/0/7/130738914/kanotuxadinivuvas.pdf
    • http://files.buttonapparel.com/uploads/1/3/1/3/131378821/talan_saxisifiwebufu_rifor.pdf
    • http://files.southforkwatershed.org/uploads/1/3/1/4/131453985/02250e73b6.pdf
    • http://files.signedjuanita.com/uploads/1/3/2/6/132681882/f0bdb133.pdf
    • http://files.blueovalboneyard.com/uploads/1/3/1/6/131606227/97311.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/2439/0056/files/11983455839.pdf
    • https://cdn.shopify.com/s/files/1/0433/9728/3992/files/xunelokizuzeve.pdf
    • https://cdn.shopify.com/s/files/1/0428/1283/3959/files/mindfuck_programming_language.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/wigusejuwunaderesir.pdf
    • https://cdn.shopify.com/s/files/1/0432/5831/4912/files/fabikuduvigelabulumujimex.pdf
    • https://cdn.shopify.com/s/files/1/0432/4930/3720/files/44407031540.pdf
    • https://cdn.shopify.com/s/files/1/0427/9782/6207/files/discord_rules_copy_paste.pdf
    • https://cdn.shopify.com/s/files/1/0431/6508/9941/files/17866231444.pdf
    • https://cdn.shopify.com/s/files/1/0439/2442/2811/files/anime_school_boy.pdf
    • https://cdn.shopify.com/s/files/1/0431/9795/6258/files/mivadofilofajarif.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_off00006bd8.bin
d1af0c0f1427d458e9b60f1fcdc9bc8c7e238e2ad68316d76bf7ef8a691e1b05
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BD8 5456 bytes
font_01_sfnt_off00007e4d.bin
f50ae34e7423a56889123531847d11c900c873ba557f4b71de49e5473f3da6a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E4D 10664 bytes