Malicious PDF — malware analysis report

Static analysis result for SHA-256 efeab367923f5592…

MALICIOUS

PDF

44.0 KB Created: 2020-10-07 06:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cf5c0a5ef1f465fe146e51cdb0902abb SHA-1: 61e55fe238e33f4bde8da3dfdb119ac643e1631b SHA-256: efeab367923f55921ec56810997976678e1030e87d8e46b99e04e4d864761745
184 Risk Score

Malware Insights

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

The PDF contains a large number of links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that points to a pricing comparison table template, suggesting a lure for phishing or malware delivery. The ML classifier strongly indicated maliciousness.

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.link/pify?keyword=pricing+comparison+table+template In PDF document text
    • http://files.pinnaclehcbr.com/uploads/1/3/1/4/131453431/4404618.pdfIn PDF document text
    • http://files.womens-journey.com/uploads/1/3/1/4/131438464/kerojuziliv_seremoludalo.pdfIn PDF document text
    • http://files.carrollcountyjfs.com/uploads/1/3/0/8/130814390/doxuzulosuti.pdfIn PDF document text
    • http://files.littleoasis.co.nz/uploads/1/3/1/3/131398547/b557d59ad24.pdfIn PDF document text
    • http://files.arthighway.org/uploads/1/3/1/8/131858592/70bde5a.pdfIn PDF document text
    • http://files.todos-juntos.net/uploads/1/3/0/7/130739344/rifim.pdfIn PDF document text
    • http://files.rechoir.co.uk/uploads/1/3/1/0/131070096/nolonunagananik-puzukut.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/6b8cf3be-92be-447d-9bed-d0585db0fd82/kotoponalifu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b34313b-5b88-4477-b654-03087632e903/58274942110.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56fad241-9a96-4ff7-8f0e-b1d6725f6d4c/32021849189.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49e0ba9c-33af-4e78-9a26-5b88a07250d8/69210372715.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/648d7f2a-7e0f-4738-981f-b65023026633/77769744317.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b3b02f3-7229-4df4-8bf3-9ac329569f2b/77197968640.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd209401-0264-46be-9dbf-1a2c7fced46d/54774375467.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5681cd2a-4b73-41ec-83b5-892118af3372/bafuzena.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_off00006d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D35 5392 bytes
SHA-256: af4da10ef63adfdb9998612e2a1ac485d74371b6ba9be0862afd9a80b8e99f54
font_01_sfnt_off00007f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F6E 10436 bytes
SHA-256: 314e178ae4ec096cbfaef5a2b01e454f4bf8db11facaca0fe88be036fe668bad

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