Malicious PDF — malware analysis report

Static analysis result for SHA-256 b795a5e88fda4f6b…

MALICIOUS

PDF

42.2 KB Created: 2020-07-08 15:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 17d4a2e5744b49a3810e5d4c48f3db37 SHA-1: dfa67f75752cf8d1aba7aa22025d4bc2438f58ef SHA-256: b795a5e88fda4f6bd231ae152c0bd4da8972e9e3874ed370c23bc5e75790b417
224 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with SEO link farms. One prominent link directs to a known malicious redirector. The document body text, though partially obfuscated, includes the same lure ('Farberware 3.2 qt manual air fryer reviews') and URLs found in the heuristics, suggesting a coordinated effort to drive traffic to malicious infrastructure. No scripts were extracted, but the PDF structure itself is weaponized for link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.com/wb?keyword=farberware%203.2%20qt%20manual%20air%20fryer%20reviews In PDF document text
    • http://files.freedomfitreads.com/uploads/1/3/1/3/131398066/6401178.pdfIn PDF document text
    • http://files.hickmanfootball.com/uploads/1/3/0/7/130776788/kamubumul-dobozokowobiz.pdfIn PDF document text
    • http://files.tworiversrecovery.com/uploads/1/3/2/7/132740860/91cf8adff.pdfIn PDF document text
    • http://files.hscgeographyurbanplaces.hsieteachers.com/uploads/1/3/1/3/131381722/tusomamodo_kixodovos_welekat.pdfIn PDF document text
    • http://files.sjuartdesign.com/uploads/1/3/1/6/131606087/wulixakitanajukaf.pdfIn PDF document text
    • http://files.ncam.ac.nz/uploads/1/3/0/7/130776788/a94fe6a1c2f25a.pdfIn PDF document text
    • http://files.greateragapedeliveranceminitriesinc.com/uploads/1/3/1/6/131637919/807254.pdfIn PDF document text
    • http://files.electaylin.com/uploads/1/3/2/7/132740320/8322645.pdfIn PDF document text
    • http://files.pemmensgolf.net/uploads/1/3/1/3/131379612/febokibilodirina.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://sazexaki.files.wordpress.com/2020/07/18783580596.pdfIn PDF document text
    • https://dajakogeme.files.wordpress.com/2020/07/59128861538.pdfIn PDF document text
    • https://panuvezipib.files.wordpress.com/2020/06/ribunupevaga.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6543 5488 bytes
SHA-256: b02a7fdf27f223631fad62ed66b68ebf2b8ac62bc8d4a51ffe0622cabbbac2b6
font_01_sfnt_off000077fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77FD 10568 bytes
SHA-256: 54ffe534dc387045b947d944b11310caa7c106c75844ac6f64e698f1c9385b5c

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