Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09b689ee43ebee3…

MALICIOUS

PDF

55.3 KB Created: 2020-08-09 11:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb5b6161b5c3fffb7ccf7960c7fda313 SHA-1: a14d20b3ee0c82868acb96a17079bee4007469ce SHA-256: b09b689ee43ebee36db12b3a410e2e1ab2a513d492dbbb06a099bd00ccb0eb36
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded URLs. One URL points to a known malicious redirector, and the document body includes a mass of external links, suggesting a link farm or SEO manipulation tactic. The primary intent appears to be directing users to potentially harmful content through these links.

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=apache+tomcat+7+tutorial+pdf
    • http://files.prostatecure.ca/uploads/1/3/1/0/131071209/5825414bc0f60.pdf
    • http://files.effinghamelementary.org/uploads/1/3/0/8/130813427/nalofezidi-xosojozofuwa.pdf
    • http://petirugo.barklowclasses.org/uploads/1/3/1/1/131164250/litub-denaginem.pdf
    • https://cdn.shopify.com/s/files/1/0435/2763/5095/files/mastering_physics_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0434/3644/1752/files/chicago_building_code_violations.pdf
    • https://cdn.shopify.com/s/files/1/0434/2831/5293/files/81499327900.pdf
    • https://cdn.shopify.com/s/files/1/0429/0406/0071/files/mankiw_macroeconomics_9th_edition_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5823/files/relidonejif.pdf
    • https://cdn.shopify.com/s/files/1/0437/8948/4190/files/moluxibinupe.pdf
    • https://cdn.shopify.com/s/files/1/0440/5864/0549/files/concepto_analisis_foda.pdf
    • https://cdn.shopify.com/s/files/1/0428/5497/3606/files/60054154362.pdf
    • https://cdn.shopify.com/s/files/1/0434/0423/0805/files/74186563039.pdf
    • https://cdn.shopify.com/s/files/1/0436/4628/8025/files/zepomobuwoduli.pdf
    • https://cdn.shopify.com/s/files/1/0432/7417/4622/files/fiselekamoxorenid.pdf
    • https://cdn.shopify.com/s/files/1/0433/9197/5580/files/97295260199.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_off00009b22.bin
9b72d1108d561cb09362b211c905111a7e8fa2be91eb1ffc052d0dd33e1210ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B22 5288 bytes
font_01_sfnt_off0000acfc.bin
454243c44de47dc1ec9c9c3e7ca0cfb8f256973051918499b0b119a7ef53cc08
pdf-font-stream PDF embedded font (sfnt) at offset 0xACFC 10280 bytes