Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0e355234c3b5b9a…

MALICIOUS

PDF

51.3 KB Created: 2020-10-06 10:41:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 64b58eca175966e1d0f8725bb692eab7 SHA-1: d1993b155d19fbfecd1ed71ad508c3595add78fa SHA-256: d0e355234c3b5b9a8fe33f97a908e4e1b9e30e947b043e2ee8a4eeeb36a42fd8
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a game mod, likely intended to trick users into visiting malicious sites. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?keyword=case+animatronics+2+survival+mod+apk In PDF document text
    • http://files.trinicrew.net/uploads/1/3/1/4/131455956/e86f8a80780dd1.pdfIn PDF document text
    • http://files.fredtheafghan.com/uploads/1/3/0/7/130775735/8040291.pdfIn PDF document text
    • http://mokim.hccollab.com/uploads/1/3/2/7/132740228/d1ba96e20e.pdfIn PDF document text
    • http://vudanazok.thebigdropcollective.com/uploads/1/3/2/3/132303156/723914.pdfIn PDF document text
    • http://files.sonjanagy.com/uploads/1/3/2/6/132681513/pofupojadideg-tudotovogirole.pdfIn PDF document text
    • http://files.diabeticeyejournal.org/uploads/1/3/1/4/131406510/luzite.pdfIn PDF document text
    • http://files.mariosmathtutoring.com/uploads/1/3/2/3/132303219/1084528.pdfIn PDF document text
    • http://files.jessmag.com/uploads/1/3/1/8/131872104/34e9b.pdfIn PDF document text
    • https://site-1037224.mozfiles.com/files/1037224/dugidalenijewadakosolig.pdfIn PDF document text
    • https://site-1039405.mozfiles.com/files/1039405/9260804271.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/venn_diagram_math_integers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4658/2944/files/81599761535.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5603/7017/files/vista_landscape_lighting_replacement_bulbs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0465/7315/files/use_magic_device_trait_pathfinder.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000079f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79F0 5380 bytes
SHA-256: d7dcc0e16f94a29f28141378d485804819a887aef152c1c854dd3451b502958f
font_01_sfnt_off00008c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C29 10992 bytes
SHA-256: 386fd9f5cbdbf03f0d325fe5bf1a4cc52b8eecbca6b7588faf21e75ad63b3e6c
font_02_sfnt_off0000b1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A6 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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