Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79b6363fff008de…

MALICIOUS

PDF

39.9 KB Created: 2020-08-07 02:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12f06c7ae9f92e4563b84541ea3269c3 SHA-1: 6586f39e8dd2fed6d4797d263c2faa93c94ae2c9 SHA-256: b79b6363fff008de0f49f4ec6506c8b69832d43a99fb9179a8fdd3956425043b
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.com'. The document body, though partially corrupted, contains text that appears to be a lure related to secure PDF editing, aligning with the malicious URL's keyword parameter. The presence of numerous external links, many hosted on cdn.shopify.com, suggests a link farm or distribution mechanism. The ML classifier also strongly flagged this PDF as malicious.

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=beveiligde+pdf+bewerken+mac
    • http://files.nwarcticea.org/uploads/1/3/1/4/131455463/9459199.pdf
    • http://files.kateratliff.com/uploads/1/3/1/6/131606431/nubafapapibiwu_filawamibasa_vifeju_pugekozolo.pdf
    • http://files.sketchingshadowsdigital.com/uploads/1/3/0/9/130969085/2711156.pdf
    • http://files.mercedesvianochauffeurlondon.com/uploads/1/3/0/8/130813366/mipuwuxa.pdf
    • http://files.fbclocustgrovepreschool.com/uploads/1/3/1/6/131637150/7015145.pdf
    • https://cdn.shopify.com/s/files/1/0428/8937/9993/files/netitawosemogo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3328/8088/files/6480593021.pdf
    • https://cdn.shopify.com/s/files/1/0429/2411/4076/files/fujitsu_fi_6130_drivers.pdf
    • https://cdn.shopify.com/s/files/1/0434/3077/2901/files/80795467085.pdf
    • https://cdn.shopify.com/s/files/1/0429/9902/1717/files/34661840706.pdf
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/calculus_made_easy_1998.pdf
    • https://cdn.shopify.com/s/files/1/0433/0147/0366/files/java_application_programming_interface.pdf
    • https://cdn.shopify.com/s/files/1/0441/3181/1480/files/9558845627.pdf
    • https://cdn.shopify.com/s/files/1/0429/3427/2159/files/latubexoximubizipu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4617/4877/files/libijip.pdf
    • https://cdn.shopify.com/s/files/1/0428/4681/4374/files/3378989692.pdf
    • https://cdn.shopify.com/s/files/1/0437/3846/4405/files/2_digit_airline_code.pdf
    • https://cdn.shopify.com/s/files/1/0433/7152/8344/files/57638919214.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_off00005c9e.bin
de8637ec85c9889a978792a70879316b22d211089c056ebec95d39a7013168c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C9E 5700 bytes
font_01_sfnt_off00007003.bin
31c75bf6fec2b26adfe7ff361d696cbcbeade1b9b9a1d07711fb0a650e630ccd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7003 10140 bytes

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