Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c013968a68c3933…

MALICIOUS

PDF

38.2 KB Created: 2020-08-17 05:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c94ae218df7f0ba4b4500f7a0f315d20 SHA-1: 9b55bfc97e01eb345e00c48e597b9c844732e91a SHA-256: 3c013968a68c39339d96f2f551765b38b1209f1f18787aed6d8a97e5ac2c0957
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing: Spearphishing Attachment T1204.002 Malicious File: User Execution: Malicious Link

The PDF contains a large number of embedded links, many pointing to Shopify-hosted PDF files, characteristic of a link farm. One critical heuristic identified a link to a known malicious redirector at 'ttraff.com'. The ML classifier strongly flagged this PDF as malicious. The presence of the malicious redirector suggests this document is part of a campaign to lure users to malicious sites, likely for phishing or malware distribution.

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.com/pify?keyword=evaluating+limits+worksheet+answers
    • http://kelov.thesupplementstop.shop/uploads/1/3/0/9/130969426/f0809a1191ca4e5.pdf
    • http://rafil.fraclan.com/uploads/1/3/0/7/130739086/xaxoluvu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dadimutixiwukigojubiw.pdf
    • https://cdn.shopify.com/s/files/1/0430/5797/1362/files/ramakijewix.pdf
    • https://cdn.shopify.com/s/files/1/0435/1541/2632/files/losejasovizojiwet.pdf
    • https://cdn.shopify.com/s/files/1/0429/3797/4950/files/xetirageruzisosafito.pdf
    • https://cdn.shopify.com/s/files/1/0434/0108/5082/files/adelaide_showbag_guide_2019.pdf
    • https://cdn.shopify.com/s/files/1/0435/3828/4699/files/similar_triangles_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/5706/9721/files/kazoziwetixudavad.pdf
    • https://cdn.shopify.com/s/files/1/0435/5286/6455/files/levaxoxij.pdf
    • https://cdn.shopify.com/s/files/1/0435/9002/5375/files/jijijevoritara.pdf
    • https://cdn.shopify.com/s/files/1/0431/3861/3399/files/academic_ielts_writing_task_1_sample_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/9911/2095/files/jalizaxisebovopizidepuga.pdf
    • https://cdn.shopify.com/s/files/1/0433/8951/7973/files/pepumitugelav.pdf
    • https://cdn.shopify.com/s/files/1/0428/8688/9625/files/rimugovireju.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_off00004b6a.bin
2d22ad58d6d41dda8311272c99ac0712b9f6b43f4b1360894fe2e497cae5e6fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B6A 5152 bytes
font_01_sfnt_off00005cd6.bin
7c964e0990f42658f3a8a7a8b5f272584d55905ccc70a616121ffb0a2e6d97b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CD6 9768 bytes
font_02_sfnt_off00007e16.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E16 4324 bytes

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