Malicious PDF — malware analysis report

Static analysis result for SHA-256 da0c2bf8ac0a60b0…

MALICIOUS

PDF

41.4 KB Created: 2020-08-12 21:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1aca3d81404bd072d343fd0cfd21a30 SHA-1: e0d2c66123af3049769ad0bb154ce88758274985 SHA-256: da0c2bf8ac0a60b0ec2753ca27009822001f34d3183bc4ac64b459c1795609c5
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a high number of embedded links, many of which point to a link farm hosted on Shopify, and one critical link directs to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=abrsm+piano+grade+4+scales+pdf, suggesting a lure to download further malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=abrsm+piano+grade+4+scales+pdf
    • http://files.78thfrasersmontreal.org/uploads/1/3/1/4/131453245/loviferojosozus.pdf
    • http://files.roejendradesigns.com/uploads/1/3/1/4/131406762/wugagumigejo.pdf
    • http://bedovopu.miamigardensflcarpetcleaning.com/uploads/1/3/1/4/131453850/4079872.pdf
    • http://files.gracesaunders.com/uploads/1/3/2/7/132740458/nejezigokeparupigi.pdf
    • http://files.myapexhomeinspection.com/uploads/1/3/2/6/132681293/8893623.pdf
    • https://cdn.shopify.com/s/files/1/0437/2457/0792/files/74350030196.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nalekubaserigudopen.pdf
    • https://cdn.shopify.com/s/files/1/0428/3524/7271/files/80445756670.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/gezelupaxi.pdf
    • https://cdn.shopify.com/s/files/1/0430/0098/7811/files/punctuation_marks_test.pdf
    • https://cdn.shopify.com/s/files/1/0440/0391/7974/files/student_budget_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/9819/3566/files/51475125771.pdf
    • https://cdn.shopify.com/s/files/1/0429/6704/0154/files/23941125778.pdf
    • https://cdn.shopify.com/s/files/1/0435/4749/2506/files/dusakupo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7143/9001/files/90326260192.pdf
    • https://cdn.shopify.com/s/files/1/0437/1274/1529/files/32884453257.pdf
    • https://cdn.shopify.com/s/files/1/0434/5584/0409/files/73780448481.pdf
    • https://cdn.shopify.com/s/files/1/0432/2590/7368/files/situpemokibiponusu.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/43653448749.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000053c1.bin
5fef96bbff605ffda97e8034b70d74c7b8c60ddfdedd06e746efe1701e7f4c2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x53C1 4068 bytes
font_01_sfnt_off00006226.bin
032bd9de8a002205e0b39770bad6f88959bd66ce6eeb62bb34730b681a48d02d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6226 5692 bytes
font_02_sfnt_off00007561.bin
9cf450fab862dc3f1839c9f3547b9c38154b177690130a0a33cd4a2ce3a03ec7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7561 10212 bytes