Malicious PDF — malware analysis report

Static analysis result for SHA-256 134dd2b1af1a7e27…

MALICIOUS

PDF

45.4 KB Created: 2020-07-29 17:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e17493b38803baeef837a6154f8a729 SHA-1: c3bf4e1ad007cb785941ecd045391e03e4e822ef SHA-256: 134dd2b1af1a7e27261ab6bee9650b049885c8fecfb444822ef6fce625c6c6de
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the sheer volume of links suggests an attempt to lure users to malicious sites, potentially 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=afterburn+aftershock+pdf+portugues
    • http://files.callahansclassroom.com/uploads/1/3/1/8/131872054/lapilenanuvap.pdf
    • http://files.yburban.com/uploads/1/3/1/4/131408432/faropefow.pdf
    • http://files.gnv-daerligen.ch/uploads/1/3/0/8/130814774/dezadaselowu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/3377/8597/files/fimimasisatudopiz.pdf
    • https://cdn.shopify.com/s/files/1/0437/5232/5272/files/99368521327.pdf
    • https://cdn.shopify.com/s/files/1/0427/5575/2103/files/jaralutasuv.pdf
    • https://cdn.shopify.com/s/files/1/0437/4816/3733/files/rufupifomonokumomadotox.pdf
    • https://cdn.shopify.com/s/files/1/0432/3685/1874/files/31061504039.pdf
    • https://cdn.shopify.com/s/files/1/0440/0431/1190/files/11451901874.pdf
    • https://cdn.shopify.com/s/files/1/0432/0428/0481/files/sokopixumubed.pdf
    • https://cdn.shopify.com/s/files/1/0428/5287/6455/files/74520558137.pdf
    • https://cdn.shopify.com/s/files/1/0436/6172/1765/files/30324392446.pdf
    • https://cdn.shopify.com/s/files/1/0436/9842/1913/files/39621126313.pdf
    • https://cdn.shopify.com/s/files/1/0436/0749/0717/files/14266038014.pdf
    • https://cdn.shopify.com/s/files/1/0428/2925/0719/files/10164403499.pdf
    • https://cdn.shopify.com/s/files/1/0433/5727/4270/files/11245990649.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_off00007367.bin
1fcd1fcf9667dc75260d14833d08c40d1543408856dcda6497b3cf86515d2fa3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7367 5412 bytes
font_01_sfnt_off000085ba.bin
70c47fe8c7c0069cb49261785195beb78f5d5512e98d88fc65f0dbbb02212e16
pdf-font-stream PDF embedded font (sfnt) at offset 0x85BA 10240 bytes