Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb7aaf4f81c0087…

MALICIOUS

PDF

45.0 KB Created: 2020-07-23 05:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1d119e9f939f85ad02be1a753bf1f33 SHA-1: 253f9ddb36dd6e6ea16c2b7ec4fa2e0f1b04f790 SHA-256: 8cb7aaf4f81c00878a740b079354aab61067598fc24ebb2aee389db95dbeb760
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as a 'UK spouse visa form pdf' and a large number of external PDF links, indicating a link farm designed to distribute malware. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous embedded URLs further supports its malicious intent. The primary malicious URL identified is ttraff.ru.

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/wb?keyword=uk%20spouse%20visa%20form%20pdf
    • http://files.acupressurecentre.com/uploads/1/3/1/4/131411539/75532a9d88.pdf
    • http://files.shotwellsharkband.com/uploads/1/3/2/6/132681033/diramad_vegikakafuzamu.pdf
    • http://files.anxietyannarbor.com/uploads/1/3/1/6/131606876/sobuv-lebizo.pdf
    • http://files.pimpernelwharf.co.uk/uploads/1/3/1/4/131453250/gawavujufek-nufabol-xarin-xusavivok.pdf
    • http://files.honordaypasco.org/uploads/1/3/1/4/131406717/bomenajeku.pdf
    • http://files.pimpernelwharf.co.uk/uploads/1/3/1/4/131453250/gawavujufek-nufabol
    • https://cdn.shopify.com/s/files/1/0431/3877/7249/files/60916129967.pdf
    • https://cdn.shopify.com/s/files/1/0432/0837/6482/files/80271966599.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90209356055.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78476378890.pdf
    • https://terabami.files.wordpress.com/2020/07/310226186.pdf
    • https://lutomuwo.files.wordpress.com/2020/07/neluxigilujugoxorelanoj.pdf
    • https://zejegiligoz.files.wordpress.com/2020/07/57449482602.pdf
    • https://wogikasu.files.wordpress.com/2020/06/82901334403.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90685913575.pdf
    • https://cdn.shopify.com/s/files/1/0429/5265/5002/files/gefegixosuvufipesajulo.pdf
    • https://cdn.shopify.com/s/files/1/0440/6401/4501/files/wabutakawezeriwibirazuzow.pdf
    • https://cdn.shopify.com/s/files/1/0432/5995/3312/files/36112387843.pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/gigomufejulawexiva.pdf
    • https://cdn.shopify.com/s/files/1/0429/9807/1450/files/30032073778.pdf
    • https://cdn.shopify.com/s/files/1/0435/6951/2607/files/35434604635.pdf
    • https://cdn.shopify.com/s/files/1/0440/6129/4757/files/62218810276.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_off0000738d.bin
9739158e957bf91e1274c5d5850c2cf71937750456952bea2847cfa21c206466		 pdf-font-stream PDF embedded font (sfnt) at offset 0x738D 4968 bytes
font_01_sfnt_off00008480.bin
eae2f30f59e807ee5c36aece7c47ae5a2acb7eb04a843ff4b2e11c9dfab1b744		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8480 9984 bytes

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