Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe81c9c9a626a6e1…

MALICIOUS

PDF

38.8 KB Created: 2020-08-02 05:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cafab199fd3f0cd76a29a003c997360 SHA-1: a86f244279694ad217c67333f830538cbddfde4e SHA-256: fe81c9c9a626a6e1d1e735a76d24359a88c6c7ea66fc3ad891a9b7d5bb9de8d9
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One critical heuristic identified a link to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, contains text related to a 'yardman lawn mower manual' and the malicious URL, suggesting a lure to trick users into clicking on malicious links. No scripts were extracted, limiting the analysis of direct payload execution.

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=yardman+lawn+mower+manual
    • http://files.traininginaid.com/uploads/1/3/0/9/130969761/ba605bda8aa4523.pdf
    • http://files.ausmazehanatkhan.com/uploads/1/3/0/7/130775853/wuzef-jejubez-nunikawitami.pdf
    • http://files.bambusaglobal.com/uploads/1/3/1/0/131070294/xofatokimadiw.pdf
    • http://files.digitalspecialists.org/uploads/1/3/1/6/131607866/gozel_wabobifira.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30347825404.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gabagijujusudizal.pdf
    • https://cdn.shopify.com/s/files/1/0434/3352/5400/files/9678539507.pdf
    • https://cdn.shopify.com/s/files/1/0435/0217/4374/files/61964726274.pdf
    • https://cdn.shopify.com/s/files/1/0434/8831/3506/files/95634937820.pdf
    • https://cdn.shopify.com/s/files/1/0429/4131/7276/files/89054972443.pdf
    • https://cdn.shopify.com/s/files/1/0435/3074/8072/files/rizubogoruju.pdf
    • https://cdn.shopify.com/s/files/1/0433/1290/6405/files/53254561258.pdf
    • https://cdn.shopify.com/s/files/1/0429/8499/7025/files/tagexasonewenikaruxuwi.pdf
    • https://cdn.shopify.com/s/files/1/0434/8359/4917/files/kekasuweguzexazowimamujav.pdf
    • https://cdn.shopify.com/s/files/1/0433/3142/0319/files/busem.pdf
    • https://cdn.shopify.com/s/files/1/0435/3651/5221/files/60307385869.pdf
    • https://cdn.shopify.com/s/files/1/0430/6177/2442/files/80607063658.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_off00005a8f.bin
181f3bbc6bfaba8cb6d32535ad1fe42ca57befa78691e3ec7e349cc830d6c7e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A8F 4848 bytes
font_01_sfnt_off00006b03.bin
b90dfea30cff016982254fe304e6c0e990e39eaf454564009aaeb2f985111ca2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B03 10388 bytes

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