Malicious PDF — malware analysis report

Static analysis result for SHA-256 164b3aae5dd056d6…

MALICIOUS

PDF

48.3 KB Created: 2020-08-08 21:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 771f82883f8f94657b6399cadfc9f7f9 SHA-1: fd7a7ad3d9e6e1dc7fa47ab451c5c408635a3cda SHA-256: 164b3aae5dd056d6b6c639d6e1a33b5d67b571164bb15803278cfa82877ec61f
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external PDF files, constituting a link farm. One of the primary links directs to a known malicious redirector, indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content.

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=russian+english+dictionary+of+verbal+collocations+pdf
    • http://files.jokerentertain.com/uploads/1/3/0/8/130814784/3342286.pdf
    • http://files.awhillans.com/uploads/1/3/1/4/131483371/doxivotujizarag-busokugiratevus-gajavomizedubed.pdf
    • http://files.evavoutsaki.com/uploads/1/3/2/6/132682471/nefaburusijes_tilorad.pdf
    • http://files.terraobscura.net/uploads/1/3/0/7/130740257/4486629.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0712/3357/files/appraisal_form_216.pdf
    • https://cdn.shopify.com/s/files/1/0450/6845/1992/files/animal_tissue_culture.pdf
    • https://cdn.shopify.com/s/files/1/0430/5358/0439/files/28046666212.pdf
    • https://cdn.shopify.com/s/files/1/0429/8794/6133/files/tekubopodubixaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29121996303.pdf
    • https://cdn.shopify.com/s/files/1/0433/1234/9334/files/74386013360.pdf
    • https://cdn.shopify.com/s/files/1/0429/2172/2015/files/wogodum.pdf
    • https://cdn.shopify.com/s/files/1/0435/7062/6723/files/put_animated_gif_in.pdf
    • https://cdn.shopify.com/s/files/1/0429/4580/6503/files/gimekoxusivifajon.pdf
    • https://cdn.shopify.com/s/files/1/0432/5349/8014/files/71858052278.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_off00007d71.bin
9342cd384c36120a32461741060000d49e85876719a12ed53dd63098333f92ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D71 5724 bytes
font_01_sfnt_off000090f9.bin
c9ced234884b964dec5909f70e7ab2384eef5ab877dd091a191a07af5ab22ec7
pdf-font-stream PDF embedded font (sfnt) at offset 0x90F9 10316 bytes