Malicious PDF — malware analysis report

Static analysis result for SHA-256 984f3eaf44db3324…

MALICIOUS

PDF

41.2 KB Created: 2020-08-19 12:41:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2788746284614d5b7bb7f1b35c94de1 SHA-1: 3f5a9ffdaf3b366b3d142e38de290a77c34fb0b0 SHA-256: 984f3eaf44db3324fbc3ae26352a350d3242a03ff19ed2f651cc4e92e9faa22a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL and appears to be a lure for a 'free a4 birthday card template'. The presence of numerous embedded links, many hosted on Shopify, suggests a link farm or distribution mechanism. The ML classifier also strongly indicated maliciousness.

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=free+a4+birthday+card+template
    • http://files.hillsviewmontessori.com/uploads/1/3/0/7/130775728/majomosa.pdf
    • http://files.threegirlsquilting.com/uploads/1/3/1/8/131871864/fodulananinotezenuni.pdf
    • http://files.shopmaisongreige.com/uploads/1/3/2/6/132695734/180898.pdf
    • https://cdn.shopify.com/s/files/1/0430/2694/0067/files/3d_maker_for_revit.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7253/files/54013162437.pdf
    • https://cdn.shopify.com/s/files/1/0440/7649/9096/files/serials_unlock_the_world.pdf
    • https://cdn.shopify.com/s/files/1/0428/2331/9715/files/xawojijijoxowul.pdf
    • https://cdn.shopify.com/s/files/1/0434/4394/5628/files/wafeferarikurofi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0709/8529/files/mini_diagnostic_interview.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/47184882359.pdf
    • https://cdn.shopify.com/s/files/1/0434/6816/1176/files/lokoven.pdf
    • https://cdn.shopify.com/s/files/1/0431/2429/3794/files/87836754594.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/71299233386.pdf
    • https://cdn.shopify.com/s/files/1/0431/0453/4692/files/69540691858.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006448.bin
973195f9af336b7a0d6cb41a480c29fddc2d1d32a0f9d94ac4a1e7c2d3dbe814
pdf-font-stream PDF embedded font (sfnt) at offset 0x6448 5420 bytes
font_01_sfnt_off00007691.bin
986b2b634283520c5e1e2c4ba01d9c47bb60bc58add9b596d98059ea9908c0be
pdf-font-stream PDF embedded font (sfnt) at offset 0x7691 9844 bytes