Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffee91a595b147c7…

MALICIOUS

PDF

68.6 KB Created: 2020-12-16 01:28:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70e9f792d7e7b96cd703899b5cfd3687 SHA-1: aecb52398fa9fd3219ce87e421762f52037dd839 SHA-256: ffee91a595b147c7353aa3d904eed380ab9b16d730b2a612224d99b95c5aa5c4
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF file contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK indicating a link to known malicious infrastructure. Another critical heuristic, PDF_SEO_LINK_FARM, suggests the document is part of a link farm. The ML classifier also flagged the PDF with high confidence. The document body, though heavily obfuscated, contains text related to 'android root apps' and 'wkhtmltopdf', suggesting a lure to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cctraff.ru/aws?utm_term=best+android+root+apps+2019
    • https://cdn-cms.f-static.net/uploads/4505159/normal_5fb7060aa8a3f.pdf
    • https://fobuxowomi.weebly.com/uploads/1/3/4/2/134235628/lowif-lalekimujebak-tosilujejapur-jigebezima.pdf
    • https://cdn-cms.f-static.net/uploads/4491157/normal_5fbdc55ead266.pdf
    • https://cdn-cms.f-static.net/uploads/4382639/normal_5fa0e5c2828e9.pdf
    • https://dugajivesunilo.weebly.com/uploads/1/3/4/8/134866737/kikut.pdf
    • https://cdn-cms.f-static.net/uploads/4376372/normal_5f9231468dfdc.pdf
    • https://vajugape.weebly.com/uploads/1/3/4/7/134767319/05304b1c1287cd4.pdf
    • https://bekijarodik.weebly.com/uploads/1/3/4/6/134617997/litamagul.pdf
    • https://xemuputib.weebly.com/uploads/1/3/4/5/134506680/suzitopivavibitubetu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/02342a3f-a07a-4c9e-bc4f-909579bf08a7/birorazim.pdf
    • https://s3.amazonaws.com/fedufiporara/candy_apple_red_toyota.pdf
    • https://uploads.strikinglycdn.com/files/4d9788f5-f73d-42e9-9d3e-d45c1c35cef9/26526032874.pdf
    • https://uploads.strikinglycdn.com/files/a5088647-113c-4427-8408-faaf70e84c58/4905687649.pdf
    • https://uploads.strikinglycdn.com/files/c2f072bc-17a6-4bdd-8b2e-a596414807db/25586252170.pdf
    • https://s3.amazonaws.com/megodipewukitoj/17647583807.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_off0000cf07.bin
71697791f112b607016112d1a9105a47b1dad65ed15e3c32268eae1953e6b05d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF07 5452 bytes
font_01_sfnt_off0000e1a0.bin
fd9afc4ae1c09628255a3fdd22a7595d9bc50d01d5ea0811c104251c7e0c9f05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A0 10468 bytes

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