Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb513ce65e125e0…

MALICIOUS

PDF

37.2 KB Created: 2020-08-09 22:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12c7f914c046d1952b1eb85c913d5e12 SHA-1: 8a3b0efbd4e174434eb6704c40b315c7dcc0d483 SHA-256: 4bb513ce65e125e0bb164f1623474df3f8d2ba94ceebfb61013a9b660bf47103
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a significant number of embedded links, with one heuristic specifically identifying it as a 'PDF SEO Link Farm'. The primary malicious URL, 'https://ttraff.com/pify?keyword=bs+publications+pdf', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious URL and several other PDF links, suggesting a content-luring or redirection scheme.

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=bs+publications+pdf
    • http://lexejavup.grumpytg.com/uploads/1/3/1/6/131606260/6129379.pdf
    • http://files.gbyws.org/uploads/1/3/1/4/131483019/paludizixi-pazibokadelok-xovubonavegazuz-nobuxudisapefod.pdf
    • http://files.cebutoursandtravel.com/uploads/1/3/2/3/132303099/5669096.pdf
    • https://cdn.shopify.com/s/files/1/0432/1024/4256/files/kafuxemojumegudulojevik.pdf
    • https://cdn.shopify.com/s/files/1/0437/1464/2070/files/pefikadidokakigusogo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4336/4759/files/54888133932.pdf
    • https://cdn.shopify.com/s/files/1/0431/7066/0508/files/byomkesh_bakshi_all_stories_in_bengali_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wojilezufaguxulidumusad.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90840236881.pdf
    • https://cdn.shopify.com/s/files/1/0431/6620/4066/files/kidamimo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7916/3285/files/razezoxijinimuxoxu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6225/3978/files/79194876616.pdf
    • https://cdn.shopify.com/s/files/1/0432/6480/2982/files/54299604977.pdf
    • https://cdn.shopify.com/s/files/1/0433/4760/7720/files/radians_to_degrees_python.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37263727017.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_off0000531e.bin
57d7b233a489f57ee84eeb6672b7a4c622f03c8a0460f725ceb55dacdf980b99
pdf-font-stream PDF embedded font (sfnt) at offset 0x531E 5244 bytes
font_01_sfnt_off00006507.bin
3645e32d43da3fa27d2e1871f768de0136d549612669534eda67bfb7f9aad335
pdf-font-stream PDF embedded font (sfnt) at offset 0x6507 10276 bytes