Malicious PDF — malware analysis report

Static analysis result for SHA-256 d30c637adbda2f60…

MALICIOUS

PDF

42.6 KB Created: 2020-09-18 19:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcbf4eb5b1fd77a263dfadf15439c2b7 SHA-1: fcb6d35bcee28dc705b78a56228ffb03a00ea74b SHA-256: d30c637adbda2f60f8b3687fc2d49894043f74e7c07787769a2aca3576399684
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high number of embedded external links, many of which lead to redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body contains a URL that appears to be part of the link farm, suggesting a lure or redirection mechanism. The presence of numerous links to external PDF files indicates a link farm designed to manipulate search engine results or distribute malicious 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.link/wix?keyword=skyrim+wylandriah+reddit
    • http://jujupew.thecuriouscommuter.com/uploads/1/3/1/0/131070722/2805267.pdf
    • http://nedadober.leadypaw.com/uploads/1/3/2/3/132303382/6528625.pdf
    • http://files.sydneylimitedstreetrodders.com/uploads/1/3/0/7/130740517/fa7c26ef.pdf
    • https://cdn.shopify.com/s/files/1/0435/1967/2472/files/95736886282.pdf
    • https://cdn.shopify.com/s/files/1/0438/2985/4368/files/happy_6th_anniversary_images.pdf
    • https://cdn.shopify.com/s/files/1/0439/4542/7102/files/1173272200.pdf
    • https://cdn.shopify.com/s/files/1/0435/2730/7423/files/medozivitafibaluxufit.pdf
    • https://cdn.shopify.com/s/files/1/0432/0827/8171/files/wesagijix.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9209/files/cifs-_utils_redhat.pdf
    • https://cdn.shopify.com/s/files/1/0433/5419/4070/files/cyclical_theory_of_history.pdf
    • https://098e2b12-47ac-4f86-a2a0-715f7a30277d.filesusr.com/ugd/516793_7d11119f384f4cfb86beb29d0223b523.pdf?index=true
    • https://73b82c75-8651-412f-a8a7-c1564ce7dc06.filesusr.com/ugd/e56fe2_47e85269c2b44a97b8d9b72617c2caa1.pdf?index=true
    • https://e5c9f618-87cd-48e4-8710-d5b938dbd864.filesusr.com/ugd/8ce377_0e20d744d0134694982f8b38e7b9803e.pdf?index=true
    • 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_off0000682e.bin
520863b834cd8d6290039eae7bbf71761b953a092aac25d33c74e7ac5357700f
pdf-font-stream PDF embedded font (sfnt) at offset 0x682E 5248 bytes
font_01_sfnt_off000079f0.bin
833d055daa5ecc0485b24feb8375c95139caebdec64fea376bac5acad5c22a7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x79F0 10512 bytes