Malicious PDF — malware analysis report

Static analysis result for SHA-256 b520d1f462dc0319…

MALICIOUS

PDF

34.4 KB Created: 2020-07-08 22:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: ede0661d0a3408b248a90ede35ad5b00 SHA-1: 56747fff0438efedf36c68caaf101b87b6f71143 SHA-256: b520d1f462dc0319087e8f4f3bfe0fab31c9d3a2f86a9dee12805c7cf4e59cb0
184 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 external PDF files hosted on various domains. One critical heuristic identified a link to known malicious redirector infrastructure (ttraff.com), and another flagged the document as a PDF SEO link farm. The ML classifier also strongly indicated maliciousness. The document body, while containing garbled text, includes the same URLs, reinforcing the link farm and redirection attack pattern.

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.com/wb?keyword=two%20word%20verbs%20worksheets%20for%20grade%203 In PDF document text
    • http://files.sydneynewhorizons.org/uploads/1/3/2/7/132710787/lozaratorepu_tatira.pdfIn PDF document text
    • http://files.designsbycarolann.com/uploads/1/3/0/8/130814513/ac27058e6e8.pdfIn PDF document text
    • http://files.paulavanbeek.com/uploads/1/3/1/6/131607889/zujep.pdfIn PDF document text
    • http://files.demornewarrenddub.com/uploads/1/3/1/4/131409170/dakodup-simegi.pdfIn PDF document text
    • http://files.americanfoursquare.us/uploads/1/3/2/7/132740218/majibomavapakabopi.pdfIn PDF document text
    • http://files.dartendistrict.com/uploads/1/3/1/8/131856381/jarukid.pdfIn PDF document text
    • http://files.yourroadmaptohealthcarereform.com/uploads/1/3/2/6/132695574/6cb1f2d980e8e1.pdfIn PDF document text
    • http://files.ateneochambersingers.com/uploads/1/3/1/4/131408913/66152.pdfIn PDF document text
    • http://files.horshamtreesurgeons.co.uk/uploads/1/3/1/4/131408741/1f20e750890.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://vosivulapib.files.wordpress.com/2020/07/73622917840.pdfIn PDF document text
    • https://dozobozugut.files.wordpress.com/2020/06/vixosuwudanefirofugatiwi.pdfIn PDF document text
    • https://metekaz.files.wordpress.com/2020/06/70793317296.pdfIn PDF document text
    • https://vifagarov.files.wordpress.com/2020/07/7716019628.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/welilavuruwad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70945418412.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/figarawevig.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_off000049ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49ED 5240 bytes
SHA-256: 39edab08cce21a2bdcadf2b66580361d3391a315eed98145b64cf2acf3878b4e
font_01_sfnt_off00005bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BED 9524 bytes
SHA-256: c4b6fb3e79ca6ef180cf723a60fed8a58b47d7c198f62ee20340ee61c6c0a5a2

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