Malicious PDF — malware analysis report

Static analysis result for SHA-256 08ef823212d63a97…

MALICIOUS

PDF

43.1 KB Created: 2020-08-08 12:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f21d0fec2969f88fbdeada01bc39ee4 SHA-1: 515cbaddf1777eb4b285d15b614ba6538f651f03 SHA-256: 08ef823212d63a97b8347a987588d97f630a2aeb8eda1317535a993c7ab9dabf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links, including one pointing to a known malicious redirector at 'ttraff.com'. The document body and embedded links suggest a tactic of creating a link farm, potentially to manipulate search engine results or lure users to malicious sites under the guise of 'bank test books pdf'. The ML classifier strongly indicates malicious intent.

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=bank+test+books+pdf
    • http://guxugu.youmakethedifference.net/uploads/1/3/1/4/131408056/kopesokafuko-voduzuwexe-dutazuniw-zebikof.pdf
    • http://files.shibaniclews.com/uploads/1/3/0/9/130969841/6e288.pdf
    • http://files.beingfrankblog.com/uploads/1/3/1/4/131482930/lozawipe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4729/5898/files/57567701400.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65939759823.pdf
    • https://cdn.shopify.com/s/files/1/0431/0204/4316/files/iowa_math_test_6th_grade_practice.pdf
    • https://cdn.shopify.com/s/files/1/0437/1418/3323/files/gobogowedanabimufok.pdf
    • https://cdn.shopify.com/s/files/1/0429/0176/6310/files/seludereregidananu.pdf
    • https://cdn.shopify.com/s/files/1/0427/8996/1884/files/panugererogezanotuvedejuv.pdf
    • https://cdn.shopify.com/s/files/1/0430/6527/8625/files/60136390978.pdf
    • https://cdn.shopify.com/s/files/1/0431/8697/8984/files/kozibiwivoxuxafa.pdf
    • https://cdn.shopify.com/s/files/1/0429/0176/6310/files/90629697413.pdf
    • https://cdn.shopify.com/s/files/1/0434/6049/3474/files/vawigibijaruwedupumuwug.pdf
    • https://cdn.shopify.com/s/files/1/0434/7500/9696/files/abn_registration_form.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_off000068cf.bin
3d54d0352e95de0c743e04d2c8c9daa2001935f7df357bf4f7994d2fff035ce8
pdf-font-stream PDF embedded font (sfnt) at offset 0x68CF 5160 bytes
font_01_sfnt_off00007a71.bin
d3625d5670ff31d41e3fd48f40f8f75b257d8b06bcdd014f15171aa9c1ba2b9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A71 10564 bytes