Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18392c5b0426e38…

MALICIOUS

PDF

42.3 KB Created: 2020-10-10 00:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 668a60b8dc8136f3c7379d83b60a4238 SHA-1: f22c9de7d44d7b86a7adc005d7309d7d95b4d984 SHA-256: b18392c5b0426e38e9e3a325eba2290b85f9d36f5964c946094c39c16fd22642
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a redirector service. The document body, though partially corrupted, includes a URL that appears to be the primary lure, directing users to 'cctraff.ru'. This infrastructure is flagged as a malicious redirector, indicating an attempt to lead users to malicious content. The presence of a large number of external PDF links suggests a link farm or SEO poisoning tactic.

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/strik?keyword=main+causes+of+ww1+worksheet+answers In PDF document text
    • http://gobivitoj.surjbaltimore.org/uploads/1/3/0/7/130738779/xuleru.pdfIn PDF document text
    • http://files.calkdr.com/uploads/1/3/2/8/132815882/reribizuk-vevamikovaz-pomebolofilebuv-basukuvogokaxa.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/113ce49a-d9ca-4a8f-b5bb-98aa8d5c050f/kisukojesiwukarugudovinu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60c7a7b8-a941-455d-9fcc-d00665580aa4/61524352999.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b254abd-4387-413d-b034-0fcdf8146029/getigex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4786/8826/files/fovasogekodutoruni.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/9044/2917/files/gofejizafafobejawuvifo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/6668/3292/files/60v_dewalt_battery_home_depot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7026/1914/files/lart_du_menuisier.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8188/2013/files/how_to_kill_ancano_bug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/454e2f4c-5a69-4ec1-a863-027098f13923/pikixabutenefawuzu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6efc0c90-98c5-4ee5-be8d-afa6962ccb88/10263679846.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4c2d9a8-76fa-4763-a4a6-0033b9978dc2/veluzosofeloribedad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14c8b68d-e4c8-4e19-b3c0-3fcf18fdd074/64238187587.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62267db7-8475-4a11-8928-af56a088598c/pelexidiwekawemok.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_off000067d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67D0 5148 bytes
SHA-256: c18424e2735033e0f2f1f987967031b97c31c4fe5271ccb1f12f6af4092904ca
font_01_sfnt_off00007976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7976 10184 bytes
SHA-256: e29152ecb813ee225a4ff7258457d6bbbb1d94f99bdbd3c6e5b303b2ea539cf0

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