Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0a33d2ef05fda19…

MALICIOUS

PDF

50.2 KB Created: 2020-10-17 22:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 91e22d5543562390a090a8842d449b1f SHA-1: f9f26fce174c3155f24429763910f7bd51adb8f8 SHA-256: c0a33d2ef05fda1908b67d6003f1f511ba078f459304c97b6f297d1345243730
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, many of which point to disposable hosting and redirectors, indicating a link farm designed to distribute malware or engage in phishing. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL leading to malicious infrastructure, and the ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics and IOCs.

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://ttraff.me/123?keyword=hp+sprocket+plus+printer+manual In PDF document text
    • https://duxixujojive.weebly.com/uploads/1/3/0/7/130739103/semakuzulapata-binegovefawozan.pdfIn PDF document text
    • https://roninuvanajeg.weebly.com/uploads/1/3/1/3/131379749/4433998.pdfIn PDF document text
    • https://pituluwo.weebly.com/uploads/1/3/1/4/131437949/10994475.pdfIn PDF document text
    • https://bewupoterefi.weebly.com/uploads/1/3/1/3/131380107/boreko-ginopebavafirew.pdfIn PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/7376adbed2.pdfIn PDF document text
    • https://tipefejiri.weebly.com/uploads/1/3/0/9/130969755/d70a65392501f.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/7006590.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368999/normal_5f89b13d23a0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373797/normal_5f8aa7a127605.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb4d8e8d-e4bd-4ee8-94c0-36bbb35b018e/fisefes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab75a8ed-0aef-4476-941d-4aad3994e174/zojerezurofamutazixatabe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4bbaa7c-3dca-446b-bb6d-5795cc342de0/desabunenuwekeju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/843f1a13-b565-4c10-abf3-e4b8544a9a94/tafokenabimuxenabevafi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36f6d514-8b05-490b-bc77-1161b861ff72/faxowotedetisurotofig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/2758/3135/files/28135196847.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4298/7422/files/unarmored_movement_improvement_5e.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/6120/5924/files/bifotot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8432/6059/files/dresden_files_rpg.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000086cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86CD 5104 bytes
SHA-256: 3e84f27a62832d02c938613c8cf0391ec684a601db2fd712fcefc254e86bbdc3
font_01_sfnt_off00009808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9808 10456 bytes
SHA-256: 73f30685bfe5831ea6cf16042979e6258f01bb92fb04a1343325048e02a66659

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