Malicious PDF — malware analysis report

Static analysis result for SHA-256 b41151d7d9f67687…

MALICIOUS

PDF

44.3 KB Created: 2020-08-07 02:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2c982b9d852ed45384751b57bef4044 SHA-1: 0cf913eb6a8203382205d50c621c61b5fa020eac SHA-256: b41151d7d9f6768772ee4d3ffe853f62d570b41cc5a1f18bfd713cb596d52292
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a primary link pointing to a known malicious redirector. The document body, though obfuscated, includes the malicious URL and appears to be a lure for downloading further malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm designed to distribute 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=irritable+bowel+syndrome+pdf+download
    • http://files.jessicadixonmajka.com/uploads/1/3/1/6/131606758/72d9c1.pdf
    • http://files.mylittlestrongone.com/uploads/1/3/0/9/130969206/1b633777f.pdf
    • http://files.southcoastmamasandbabies.com/uploads/1/3/1/8/131856917/pagubine-muwuginoguzadu.pdf
    • http://files.rvstore.org/uploads/1/3/0/9/130969403/6657852.pdf
    • http://wotod.judiculbertson.net/uploads/1/3/0/7/130775971/roletogukagijibog.pdf
    • https://cdn.shopify.com/s/files/1/0429/2686/6599/files/26737355830.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4032/files/68735776439.pdf
    • https://cdn.shopify.com/s/files/1/0436/3314/8062/files/water_billing_system_project_report.pdf
    • https://cdn.shopify.com/s/files/1/0433/0989/1742/files/77892107898.pdf
    • https://cdn.shopify.com/s/files/1/0430/0088/9507/files/fajidelefezore.pdf
    • https://cdn.shopify.com/s/files/1/0433/8289/8840/files/74253606782.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/68363948942.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/radeziwiwilajumigetadad.pdf
    • https://cdn.shopify.com/s/files/1/0429/2716/1507/files/jowekiteken.pdf
    • https://cdn.shopify.com/s/files/1/0435/4958/9668/files/13133838583.pdf
    • https://cdn.shopify.com/s/files/1/0437/8771/4721/files/kudosorefidozigajaj.pdf
    • https://cdn.shopify.com/s/files/1/0429/3502/5831/files/ponudolokigegopo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060b2.bin
43cbc3c5168f833f84f5f442217c7c40ebc0affff9a17d207fa460bb11b075cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60B2 5244 bytes
font_01_sfnt_off00007271.bin
16933eac8801a951fc6fd33e1c34085c2a886378f25609f09dcc9b5635ef652a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7271 10508 bytes
font_02_sfnt_off00009619.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9619 4324 bytes

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