Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a7d8f48f9f9fe9…

MALICIOUS

PDF

59.7 KB Created: 2020-08-27 21:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aadf91a8a3b3446dc0319a90de9999ac SHA-1: bf0854f8a0218828ce7bf2d5cbc95789a32abede SHA-256: 82a7d8f48f9f9fe9750f42ac21e3d5ce3a33bb7f1c787747c99fc2404254349a
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector URL, indicating an attempt to lead the user to malicious infrastructure. The primary malicious URL identified is https://ttraff.club/pify?keyword=ek+duje+ke+liye+bhojpuri+song, which is likely used to obscure the final destination. The ML classifier strongly flagged this PDF as malicious, supporting the presence of malicious intent.

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.club/pify?keyword=ek+duje+ke+liye+bhojpuri+song
    • http://files.lcfanaheim.org/uploads/1/3/2/7/132740398/wexisisewobakizaxar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3582/0185/files/94225516792.pdf
    • https://cdn.shopify.com/s/files/1/0447/4516/2903/files/affiliate_marketing_training.pdf
    • https://cdn.shopify.com/s/files/1/0435/1839/4523/files/zudunoxokutete.pdf
    • https://cdn.shopify.com/s/files/1/0431/9513/8208/files/affective_learning_theory.pdf
    • https://cdn.shopify.com/s/files/1/0436/3295/1446/files/tavemexutatujadudixavezi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5654/5433/files/character_emotions_chart.pdf
    • https://cdn.shopify.com/s/files/1/0461/9121/4743/files/51300810303.pdf
    • https://cdn.shopify.com/s/files/1/0433/1234/9334/files/vitafuwuji.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a5a0.bin
a51bc1dcd898a17680d92696e805cbf872fb66343900a19463659239794765b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5A0 5348 bytes
font_01_sfnt_off0000b7d1.bin
64dee70939e39f16d1f4e2819927d58c15ced5dd725093ec17518a4ee9cd77ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D1 13784 bytes

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