Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5db54ec2fa2fe06…

MALICIOUS

PDF

47.1 KB Created: 2020-08-14 00:40:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da8a4df2446c946734973d391483c6cd SHA-1: b82f11aa3fd7d8c932161935b1a06ca0a9f83331 SHA-256: b5db54ec2fa2fe061730bafa8e34c75a5ed8f427a1d6e532d6298d9f821c0b39
152 Risk Score

Malware Insights

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

The PDF document contains a link to a malicious redirector at `https://ttraff.ru/pify?keyword=fortnite+season+4+week+5+challenges+guide`. The document also exhibits characteristics of a link farm, with numerous embedded links to other PDFs, many hosted on `cdn.shopify.com`. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector confirms a likely phishing or malware distribution attempt.

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=fortnite+season+4+week+5+challenges+guide
    • http://todepuf.rimrockshop.com/uploads/1/3/0/7/130776728/komopisev_desekegu_jemetojuzu.pdf
    • http://files.gunnsec.org/uploads/1/3/1/4/131453024/cf2fc1d37.pdf
    • http://zapov.morganjoyce.com/uploads/1/3/1/4/131437508/vutebugi_nifagitoxox.pdf
    • https://cdn.shopify.com/s/files/1/0430/8166/2628/files/ginowodu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3179/6629/files/autocad_2020_notes.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3982/files/disewavujudifoxigiri.pdf
    • https://cdn.shopify.com/s/files/1/0431/8674/9604/files/reseruwimof.pdf
    • https://cdn.shopify.com/s/files/1/0435/2350/6336/files/sapigutulen.pdf
    • https://cdn.shopify.com/s/files/1/0434/4211/0631/files/mobeperupoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/6573/7370/files/55051181883.pdf
    • https://cdn.shopify.com/s/files/1/0430/0272/4506/files/vikolujazegidona.pdf
    • https://cdn.shopify.com/s/files/1/0436/1935/2740/files/apostolic_faith_mission_church_constitution.pdf
    • https://cdn.shopify.com/s/files/1/0431/2619/4330/files/23957692978.pdf
    • https://cdn.shopify.com/s/files/1/0433/9151/6828/files/gastronomy_definition.pdf
    • https://cdn.shopify.com/s/files/1/0432/1135/8369/files/xavotov.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ae5.bin
0aaf59aacc0c2b3ffec907afc0fd8f6dcb46aae60e49aaef64410fd0095c41fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AE5 5404 bytes
font_01_sfnt_off00007d58.bin
13e38465730c0c24d7d19cdba3c4bd0607c49649f0d1a3da95225a2981480f85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D58 10524 bytes
font_02_sfnt_off0000a125.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA125 4324 bytes

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