Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca8f49559067029…

MALICIOUS

PDF

46.1 KB Created: 2020-11-07 21:40:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: fe1b13c17f0403f667c5009dfa46c125 SHA-1: e382e29d960d330e41d7416c0f2b6d70b43caf19 SHA-256: 5ca8f49559067029e5d18656f1bc13f571d9b020336f322a9da158e45420ed91
184 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many pointing to disposable hosting services and one specifically to known malicious redirector infrastructure. The ML classifier strongly indicates maliciousness, and the overall structure suggests a link farm designed to manipulate search engine results or direct users to harmful sites. No scripts were extracted, but the presence of malicious URLs is a primary indicator of compromise.

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/123?keyword=construction+management+general+contracting In PDF document text
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/zomoko-suvevigowarifav.pdfIn PDF document text
    • https://veborejekeraleb.weebly.com/uploads/1/3/4/4/134480613/xutoxu.pdfIn PDF document text
    • https://fipuvulozubonoj.weebly.com/uploads/1/3/4/3/134313175/lubawarebiw-furemisuto.pdfIn PDF document text
    • https://tevitoretej.weebly.com/uploads/1/3/2/6/132680933/nemimoraz.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/gonilaral_wonotivujej_jodemukebulus_pejadewow.pdfIn PDF document text
    • https://gokefezenomi.weebly.com/uploads/1/3/4/0/134040807/77585.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/bofejivazibap_dubebix.pdfIn PDF document text
    • https://mefevujeloz.weebly.com/uploads/1/3/4/3/134317202/jigevusex.pdfIn PDF document text
    • https://posilopawirina.weebly.com/uploads/1/3/4/3/134353572/e3a0d6fe5a1f3.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/165826c6-74e2-436e-a20d-4decb6199c4b/tuxawiluxorugapimupupo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2c3b250-d904-40dc-9294-b901cfe0b054/koxefupevu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9d5199a-9f76-47a5-aeba-eaaf6638dd9e/gurivigadulubelile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e988c20a-a0f5-480a-928f-589297a487da/76996472179.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_off0000682e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x682E 3028 bytes
SHA-256: a8bb295adce06666852798224f8c17cf63d4c16f7697ae4b42c723da0a07d689
font_01_sfnt_off0000730a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x730A 5024 bytes
SHA-256: 739ee56e8d87897128bdb8d76021db2a496d4ffaf13e616f036b544c6c4003f3
font_02_sfnt_off00008402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8402 11628 bytes
SHA-256: 34ba0083e0f1642115f222e5c89a144119943e19aa24218a6785776d47ddb42d