Malicious PDF — malware analysis report

Static analysis result for SHA-256 02141f63edb78a00…

MALICIOUS

PDF

39.2 KB Created: 2020-08-17 10:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f72a11cb04852c0dbaf1b5e7b2b4603 SHA-1: 0ea66d0ef58b40d5250a3488c0d222afd5b277b9 SHA-256: 02141f63edb78a00615af53beb1b5417664d7dd2e95531a2bf4de413a8b1a4d4
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'subject and predicate exercises' and a URL that appears to be part of a link farm. The ML classifier also strongly flagged this PDF as malicious. The presence of embedded links suggests an attempt to direct users to malicious sites, likely for phishing or malware distribution.

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.ru/pify?keyword=subject+and+predicate+exercises+with+answers+pdf
    • http://lazagis.hotelselloffs.ca/uploads/1/3/0/9/130968926/poforojaba-petadaraxad-nugogokalo-jafipubu.pdf
    • http://kedibojag.patapscomusic.com/uploads/1/3/0/8/130874431/6697760.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/rebel_yell_chords.pdf
    • https://cdn.shopify.com/s/files/1/0433/4940/9950/files/rational_irrational_numbers_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/9705/4631/files/44956683678.pdf
    • https://cdn.shopify.com/s/files/1/0433/8096/5534/files/52825138881.pdf
    • https://cdn.shopify.com/s/files/1/0428/9550/7622/files/nipufu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5531/7149/files/45001332308.pdf
    • https://cdn.shopify.com/s/files/1/0431/7036/5602/files/wunimivamekinudaxim.pdf
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/vesipotajewonejan.pdf
    • https://cdn.shopify.com/s/files/1/0430/7661/6341/files/xidamexesobitunu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7492/0347/files/24814951925.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_off000059d0.bin
0d11795092b2cba27d692a496f7ee2946d59f74cd9cd38a3e161d2f4ceb16029
pdf-font-stream PDF embedded font (sfnt) at offset 0x59D0 5692 bytes
font_01_sfnt_off00006d3c.bin
8aec2377df753773af4817979701f90d38b6eb1d3bcb8b14bb3514f7ff16c165
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D3C 10196 bytes