Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ac7a779292d72c…

MALICIOUS

PDF

42.6 KB Created: 2020-08-02 13:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccb6fe87ad6f0b60b419de7d15e1864c SHA-1: 1dd0598b0802e524f9ae30244a5d031ee6a7b0de SHA-256: 38ac7a779292d72c41692e22661a263634eabe3b2f263186a6bae5aec0017c0d
172 Risk Score

Malware Insights

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

The PDF document is identified as a malicious redirector link and an image-only lure, typical of phishing campaigns. The primary URL, https://ttraff.ru/pify?keyword=1+to+10000, is flagged as malicious. The document also contains a large number of links to PDFs hosted on Shopify, likely part of an SEO link farm to obscure the malicious redirector. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 42 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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=1+to+10000
    • http://files.haptotherapiekoningsweg.nl/uploads/1/3/0/9/130969354/86644.pdf
    • http://files.sellwoodfurniture.com/uploads/1/3/1/4/131437949/a36893bc29ae.pdf
    • http://files.rwstoneware.com/uploads/1/3/1/3/131381109/93b1ca40fd.pdf
    • http://files.dagcamera.com/uploads/1/3/0/7/130739028/1404578.pdf
    • http://files.christianmusselman.com/uploads/1/3/2/8/132816202/pesug_memuzidusiko_midum.pdf
    • https://cdn.shopify.com/s/files/1/0432/3672/0798/files/zavetikezenegedu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3434/5625/files/tilakinujibeninip.pdf
    • https://cdn.shopify.com/s/files/1/0436/9442/4232/files/68829596968.pdf
    • https://cdn.shopify.com/s/files/1/0430/9906/2421/files/10201932741.pdf
    • https://cdn.shopify.com/s/files/1/0430/4430/7098/files/zivaregukukibegapefis.pdf
    • https://cdn.shopify.com/s/files/1/0433/0727/0297/files/predicting_the_temperature_hackerrank_solution.pdf
    • https://cdn.shopify.com/s/files/1/0432/9147/6133/files/88400948264.pdf
    • https://cdn.shopify.com/s/files/1/0430/5669/3397/files/98127106322.pdf
    • https://cdn.shopify.com/s/files/1/0432/1263/6322/files/61679390590.pdf
    • https://cdn.shopify.com/s/files/1/0432/3780/2146/files/93048238790.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/75713348905.pdf
    • https://cdn.shopify.com/s/files/1/0437/6756/2391/files/dowexegiveziroladije.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_off000073db.bin
b88e8e91d78f2cd755f446540452e02e4ab473255e433833b5b39003991038e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73DB 4260 bytes
font_01_sfnt_off0000826e.bin
c24c082e72ed8ed12df7bf753bedc4ff3ec8fabd7ac1a7f54b91f5c28f078c00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x826E 8136 bytes

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