Malicious PDF — malware analysis report

Static analysis result for SHA-256 6344919995aa7ec8…

MALICIOUS

PDF

41.4 KB Created: 2020-08-28 08:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89f6402d94840ffdf5485b2539e58d0f SHA-1: c5917a63f2a5c2c590ae96be3f6098c5f1bb0f81 SHA-256: 6344919995aa7ec85ca19a48aa1d4f23fe840d03d0ec431ab1b964aff7eb8583
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple critical heuristics for containing malicious redirector links and engaging in SEO link farming. The primary malicious URL identified is https://ttraff.cc/pify?keyword=kerlinger+f+1988+investigaci%25C3%25B3n+del+c, which is likely used to redirect users to further malicious content. The document's structure and numerous external links suggest an attempt to manipulate search engine results or distribute malware through a link farm, aligning with spearphishing attachment tactics.

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.cc/pify?keyword=kerlinger+f+1988+investigaci%25C3%25B3n+del+c
    • http://kojifure.graylineconvention.com/uploads/1/3/0/9/130969858/poniboj_xasajuwa.pdf
    • http://files.millvalleychickens.com/uploads/1/3/0/7/130739340/5180252.pdf
    • http://files.loganshappyrocks.com/uploads/1/3/1/4/131406735/tepujaguz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/5330/8314/files/fs_14_apk_indir_android_oyun_club.pdf
    • https://cdn.shopify.com/s/files/1/0433/4842/6920/files/95491009207.pdf
    • https://cdn.shopify.com/s/files/1/0437/0874/3834/files/car_salesman_training_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/8376/7713/files/53532987561.pdf
    • https://cdn.shopify.com/s/files/1/0438/1832/0034/files/49501043281.pdf
    • https://cdn.shopify.com/s/files/1/0431/7632/9373/files/defugijumovemon.pdf
    • https://cdn.shopify.com/s/files/1/0430/4017/8333/files/how_to_compress_file.pdf
    • https://cdn.shopify.com/s/files/1/0430/7720/6178/files/libros_sobre_aprendizaje_cooperativo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5883/9203/files/kobamavuwuxi.pdf
    • https://cdn.shopify.com/s/files/1/0428/6382/0959/files/kometimopoxesoriruga.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85450973079.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004bae.bin
7578c565586e45324bf828821e0880417be24f5e84a3b22753baa5f401ab7a38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BAE 5436 bytes
font_01_sfnt_off00005e3e.bin
550228d800374f7acc0e1a938840535f7c7312ae9879a67df8e9d108bae04e59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E3E 13744 bytes
font_02_sfnt_off00008868.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8868 4324 bytes

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