Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3902a03d647f1bb…

MALICIOUS

PDF

44.0 KB Created: 2020-07-21 00:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fccb2f7eb5a1c29a3b07e368b306f3a SHA-1: 14a593efced3bbdd1986845f6bbe783b8a8bbb67 SHA-256: f3902a03d647f1bbe1a109c2b5037f4196e8f8e5ac346dd25afa77261e73ea04
212 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, and it contains a critical heuristic firing for a malicious redirector link. The link points to 'ttraff.com', which is likely used to redirect users to a malicious site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. The presence of a malicious redirector indicates a phishing or social engineering attempt to lead the user to a harmful destination.

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.
  • ClamAV: Pdf.Dropper.Agent-9527663-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9527663-0
  • 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/wb?keyword=eugene%20hecht%20optics%205th%20edition%20pdf
    • http://files.zaitoldme.com/uploads/1/3/1/0/131070938/d799ddf32.pdf
    • http://files.norforkschools.org/uploads/1/3/2/7/132740564/c56fd03.pdf
    • http://files.hisandherhome.ca/uploads/1/3/0/8/130874680/4279873.pdf
    • http://files.ji396.org/uploads/1/3/1/4/131437380/lasutef.pdf
    • http://files.thepetrospective.com/uploads/1/3/0/7/130775195/gozubogufagepo.pdf
    • http://files.norforkschools.org/uploads/1/
    • https://cdn.shopify.com/s/files/1/0437/9744/6816/files/35267498606.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/36149341097.pdf
    • https://cdn.shopify.com/s/files/1/0435/2340/8032/files/82427923383.pdf
    • https://ganesesuf.files.wordpress.com/2020/06/zajorenipuditavekugipel.pdf
    • https://pamifanasote.files.wordpress.com/2020/07/mozalox.pdf
    • https://lezidonopo.files.wordpress.com/2020/06/doduneluratexetapewi.pdf
    • https://lewatoxejak80521205.files.wordpress.com/2020/07/13982900668.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3643/files/tuwudawiza.pdf
    • https://cdn.shopify.com/s/files/1/0429/8548/8543/files/44435685026.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/5842387527.pdf
    • https://cdn.shopify.com/s/files/1/0429/5216/3482/files/1053992592.pdf
    • https://cdn.shopify.com/s/files/1/0434/0062/6341/files/nezokif.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4701/files/kepedagijagaganeziwoxa.pdf
    • https://cdn.shopify.com/s/files/1/0432/0568/9504/files/takibiwofenuvobiwi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/zogofaguvegujovowo.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_off00006d93.bin
637c35326aa6dd6a90763802eb2304756b98f107416020f1204ebd7d854c4f1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D93 5040 bytes
font_01_sfnt_off00007ec2.bin
d6dcd79aa541e2928ef49f2a5c5b7f5a0cbf25c89e07f94ada4d0b30884862cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EC2 10564 bytes

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