Malicious PDF — malware analysis report

Static analysis result for SHA-256 94aa2de08bb5fa07…

MALICIOUS

PDF

45.6 KB Created: 2020-08-24 23:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34b1480fbcdbd26376a0903f309268b8 SHA-1: 8deb0dd6a9338b84e3e33f8e89928eb86563acb5 SHA-256: 94aa2de08bb5fa079201fb6539d9782fab1646bace64a1909489f6b41166e572
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many pointing to Shopify-hosted PDF files, indicating a link farm. One critical heuristic identified a link to a known malicious redirector (ttraff.ru), suggesting a malicious intent behind the link farm. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious redirector and the link farm structure are strong indicators of a malicious campaign, likely for SEO manipulation or to distribute further malware.

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=bateria+litio+18650+datasheet
    • http://dubezosu.skadoodlesboutique.com/uploads/1/3/2/7/132740585/3131511.pdf
    • http://files.andersonvocal.com/uploads/1/3/0/7/130775025/8056626.pdf
    • http://files.mindyourbodyfitnessandnutrition.com/uploads/1/3/0/7/130775628/19f97.pdf
    • http://kefiwet.askthecat.org/uploads/1/3/1/0/131069934/1412711.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4442/files/watepodujapok.pdf
    • https://cdn.shopify.com/s/files/1/0432/0054/4931/files/38665275785.pdf
    • https://cdn.shopify.com/s/files/1/0435/6482/6773/files/badefatawidifimunetazap.pdf
    • https://cdn.shopify.com/s/files/1/0433/6772/7269/files/2856660416.pdf
    • https://cdn.shopify.com/s/files/1/0462/8470/1856/files/balancing_chemical_equations_worksheet_tes.pdf
    • https://cdn.shopify.com/s/files/1/0435/5594/6657/files/75008984771.pdf
    • https://cdn.shopify.com/s/files/1/0433/9433/4869/files/25781032299.pdf
    • https://cdn.shopify.com/s/files/1/0430/0609/9605/files/42983625778.pdf
    • https://cdn.shopify.com/s/files/1/0431/0509/1745/files/44800669852.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/97285982277.pdf
    • https://cdn.shopify.com/s/files/1/0431/1921/4758/files/rivatesojelijijademaw.pdf
    • https://cdn.shopify.com/s/files/1/0427/8288/4006/files/kupikesiwurukizavit.pdf
    • https://cdn.shopify.com/s/files/1/0437/9436/6626/files/79791884229.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_off000067fa.bin
a49c3e5d6f76edcc8167ed793c811c07af471ac358590c9fc5ce51035b02f1a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67FA 5628 bytes
font_01_sfnt_off00007b19.bin
e61a1500773d6dda024c0d76f4ffba6b659da52d805c2ab1758f74fccb5e0eb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B19 14792 bytes

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