Malicious PDF — malware analysis report

Static analysis result for SHA-256 790dfa11784fae05…

MALICIOUS

PDF

60.5 KB Created: 2020-10-30 14:33:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 17c8f2ae12ccb2fee5cd0a74ef4fd12b SHA-1: d2d452e4144862bec0273c323926624c3566e074 SHA-256: 790dfa11784fae05a8aad5bcf575b759f32e4bb0df4c3e158a3eaa28ab67af57
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a heuristic firing indicating it links to known malicious redirector infrastructure, specifically 'https://cctraff.ru/aws?keyword=opera+omnia+apk+hack'. The document also exhibits characteristics of a link farm, embedding numerous external PDF links, many of which are hosted on cloud storage or free website builders. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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://cctraff.ru/aws?keyword=opera+omnia+apk+hack In PDF document text
    • https://zafozudakajadev.weebly.com/uploads/1/3/0/8/130814863/xujewonagamaxu.pdfIn PDF document text
    • https://bavejojonosepes.weebly.com/uploads/1/3/1/3/131380601/65e6fb.pdfIn PDF document text
    • https://jugefisofewutep.weebly.com/uploads/1/3/4/3/134368120/7a4b056e6d27f.pdfIn PDF document text
    • https://palifeselaliku.weebly.com/uploads/1/3/4/4/134441248/cd20b77.pdfIn PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/resesemeni.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/2e95561a-e434-48f4-8433-de5a17e65382/jupirem.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/nenotimapewiwo.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/zuzeju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d52b7ca1-daa1-4b8f-80d3-75706ae84a0a/26048808960.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/bebras_2018.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/2944/1954/files/sound_engineering_books.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3055/6053/files/fetal_tachycardia_causes.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/lapinamanejerekiwawibiwo.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DAA 6440 bytes
SHA-256: 2ce5a7286efefc5aae27ce1c31b3347e159d00bd30cf97f509a0b7f7d49caffb
font_01_sfnt_off00008d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D6E 2900 bytes
SHA-256: 40ce0bc9b113ef031639604f059b60aa9f1e41b097d60e75bfbf620cccc66306
font_02_sfnt_off000097b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97B2 5052 bytes
SHA-256: 3301ccf7c59df30e0917d335a674acc772b2f155e530fdd07280b26c024407ec
font_03_sfnt_off0000a8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8B6 11164 bytes
SHA-256: 444464965208739c8b2f237a1c4653c0bc9fba709930c51de1b11f290dfe5542
font_04_sfnt_off0000cef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF7 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67

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