Malicious PDF — malware analysis report

Static analysis result for SHA-256 5edda9890823ffe0…

MALICIOUS

PDF

77.4 KB Created: 2020-09-17 14:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 841e9917bd7fb3f2c7d0f0e63172c916 SHA-1: ea5d4e31bc504aab7186f03ebeb834434a1d644e SHA-256: 5edda9890823ffe04f7499eab85ce74201f7cb85212779167ac16eed45f1f65e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.link/wix?keyword=cap%25C3%25ADtulo+4b+answers+realidades+2'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external PDF links, including one to 'https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tanedikefiresemur.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.link/wix?keyword=cap%25C3%25ADtulo+4b+answers+realidades+2
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tanedikefiresemur.pdf
    • https://cdn.shopify.com/s/files/1/0438/2133/4690/files/zunebat.pdf
    • https://cdn.shopify.com/s/files/1/0429/9164/8929/files/29857290457.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/kupidatanuzapip.pdf
    • https://cdn.shopify.com/s/files/1/0434/6911/1448/files/12420330063.pdf
    • https://df3564d8-b28a-4be3-accb-497fae65363d.filesusr.com/ugd/7a359d_6d0568fe48054a3bbfed841c87cad7a0.pdf?index=true
    • https://086bc699-34e7-48b9-8db6-e42f6e755b64.filesusr.com/ugd/bb05c1_1bb83de1612443b5bfacac2aebfa8928.pdf?index=true
    • https://bd881cd8-6c6a-4b47-ad96-2a12e383b5df.filesusr.com/ugd/b98abb_2445690a45844e2a84e1e9afb43e42f7.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0437/7860/5210/files/vemejije.pdf
    • https://cdn.shopify.com/s/files/1/0429/8578/3447/files/airscreen_fire_tv_apk.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c554.bin
5195f8fa24c9e1ebf2f3ab5ff82e9ecd8ac05022993ba1a313c2fe3acb2ece3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC554 5364 bytes
font_01_sfnt_off0000d7b5.bin
e2ee02ebbcca99b45757c04e8b167417b1411621501bcea3052d6ae0c9343585		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B5 13648 bytes
font_02_sfnt_off000103e0.bin
52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103E0 16036 bytes
font_03_sfnt_off00011848.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11848 4324 bytes

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