Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4bdacff5518b401…

MALICIOUS

PDF

41.7 KB Created: 2020-08-20 21:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e63f23a401a86542b888dcb507b5e8c1 SHA-1: b48cd7bb978acbf0e2d64f27b362c8f147559e8f SHA-256: c4bdacff5518b401b4c0e5848e306e37dad5bbdbc044f5f1ed5b1ed7c5c96170
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a critical heuristic for linking to a known malicious redirector, specifically 'https://ttraff.ru/pify?keyword=root+android+via+pc+offline'. Additionally, it exhibits characteristics of a PDF link farm, containing numerous external links, many hosted on cdn.shopify.com, which is a common technique for distributing malicious content or conducting phishing campaigns. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=root+android+via+pc+offline
    • http://torefitu.centerforessayexcellence.com/uploads/1/3/1/0/131070493/mebagi.pdf
    • http://files.aliconway.co.uk/uploads/1/3/2/8/132814239/6f84135c5e.pdf
    • http://files.tieabowfineart.com/uploads/1/3/0/8/130874143/14a35a9b6.pdf
    • http://pazewori.godlovesyou.tv/uploads/1/3/1/3/131383664/9060112.pdf
    • http://files.cruisencocktails.com/uploads/1/3/0/7/130775331/7216272.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9477/files/47205703385.pdf
    • https://cdn.shopify.com/s/files/1/0436/3524/5214/files/canvas_uky_edu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/3100392900.pdf
    • https://cdn.shopify.com/s/files/1/0430/3316/5986/files/94349461113.pdf
    • https://cdn.shopify.com/s/files/1/0430/9362/2935/files/47357832491.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6505/files/funeral_invitation_template_uk.pdf
    • https://cdn.shopify.com/s/files/1/0433/2391/6443/files/new_york_times_crossword.pdf
    • https://cdn.shopify.com/s/files/1/0427/5693/1751/files/hp_blade_server_configuration.pdf
    • https://cdn.shopify.com/s/files/1/0430/8143/3242/files/physics_formulas_for_class_9_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/9100/0472/files/ruwaxakoguga.pdf
    • https://cdn.shopify.com/s/files/1/0428/9354/1532/files/26650435695.pdf
    • https://cdn.shopify.com/s/files/1/0437/6638/2749/files/breaking_bad_news_adalah.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_off000064fd.bin
d16de8a841d51878760d8d1233976349ce52885c5c45d06c94189e238e386fcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64FD 5040 bytes
font_01_sfnt_off00007638.bin
23a8a8bf0eb08fc62a52bb8c4c674d03f880a0938d828e0d2c22e55dd9a986f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7638 10268 bytes

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