Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea9e261b5701633a…

MALICIOUS

PDF

41.7 KB Created: 2020-08-07 22:42:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f428f1000a8f4186d65c310f9be0c9aa SHA-1: 8862e71664b589046026866e8412a7c0f720549c SHA-256: ea9e261b5701633a2bd405ef649d5de382db75008b954dbd314bcf49a6125f3b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in

The PDF document was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ttraff.ru/pify?keyword=hey+soul+sister+ukulele+pdf`. Another critical heuristic indicates a PDF link farm, with 17 external PDF links, many hosted on `cdn.shopify.com`. The document body contains garbled text and embedded URLs, suggesting it is not intended for legitimate reading but rather as a lure to external malicious content.

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=hey+soul+sister+ukulele+pdf
    • http://files.protectionfenceco.com/uploads/1/3/1/6/131606134/pogore.pdf
    • http://files.thegauge.us/uploads/1/3/0/7/130776167/kobefelutakam.pdf
    • http://files.medwellnessclinic.com/uploads/1/3/1/8/131871518/e572dfe8633c97.pdf
    • http://gajozuma.michaelglennphoto.com/uploads/1/3/0/7/130775169/warerenusepe_zoxilase.pdf
    • https://cdn.shopify.com/s/files/1/0428/8705/3471/files/6955206535.pdf
    • https://cdn.shopify.com/s/files/1/0434/8382/4294/files/sigotiketazutijaxopibomu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9633/4753/files/mojopatugixipi.pdf
    • https://cdn.shopify.com/s/files/1/0430/1016/2837/files/bijubajisarogubisejekix.pdf
    • https://cdn.shopify.com/s/files/1/0447/8061/7885/files/penguin_books_free.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/10711729991.pdf
    • https://cdn.shopify.com/s/files/1/0441/3744/7576/files/pennzoil_oil_filter.pdf
    • https://cdn.shopify.com/s/files/1/0429/8915/8554/files/11525596483.pdf
    • https://cdn.shopify.com/s/files/1/0429/8748/7385/files/zuwalaxomuvobi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1384/0793/files/63123497297.pdf
    • https://cdn.shopify.com/s/files/1/0433/3076/4968/files/2914412704.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6925/files/fekifulixi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0315/8433/files/wonewulunegobavulur.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_off00005d7b.bin
2617ccac7730559a6eab8eb8c6a17c3531e367830a8c6166755f93fbfd83e9d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D7B 4952 bytes
font_01_sfnt_off00006e71.bin
f36ab85df3ea9391718eca434ed51818e7c1cd87411563f2e5dfe4ab9b3e445f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E71 14120 bytes

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