Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a13a171e4efff7b…

MALICIOUS

PDF

44.8 KB Created: 2020-07-08 12:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-15
MD5: 39b1e67e4f6ef69a6d767fc1bad1c4a3 SHA-1: 61d310034ca637e6178cec10f73afd5902268442 SHA-256: 2a13a171e4efff7bd9efb9b68510a6cd0ed84c8ab4df5d454d318cf16aab8879
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains numerous embedded links, including a redirector link to ttraff.ru, which is flagged as malicious. The document body and embedded links suggest a lure to download further malicious content disguised as 'agricultural entomology books pdf'. The PDF_SEO_LINK_FARM heuristic indicates a large number of generated links, likely for SEO manipulation to distribute malicious content. No scripts were extracted from this sample.

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.ru/wb?keyword=agricultural%20entomology%20books%20pdf In PDF document text
    • http://files.carrcommunity.org/uploads/1/3/2/6/132695572/cdc1ca608.pdfIn PDF document text
    • http://files.annkellettediting.com/uploads/1/3/1/3/131379290/577801.pdfIn PDF document text
    • http://files.flatspokecycles.com/uploads/1/3/1/4/131408529/6549756.pdfIn PDF document text
    • http://files.storymakerlife.com/uploads/1/3/0/7/130775511/beluxatitovexaxejej.pdfIn PDF document text
    • http://files.dbtdelaware.com/uploads/1/3/1/1/131163563/2ca8fdf3d.pdfIn PDF document text
    • http://files.atlantasteinwaysociety.com/uploads/1/3/1/6/131606550/wugavawopilen-besezasifijavax-movedaxepefag-zajuvebozoka.pdfIn PDF document text
    • http://files.morjimcocopalms.com/uploads/1/3/1/3/131384789/2a0aea98a146c0c.pdfIn PDF document text
    • http://files.healthenpointe.com/uploads/1/3/0/7/130775053/mutixareguxalo.pdfIn PDF document text
    • http://files.koahspearguns.com/uploads/1/3/0/8/130813849/worabugesezu_fowipe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dixurozazix.files.wordpress.com/2020/07/jodisajufulik.pdfIn PDF document text
    • https://jivifok.files.wordpress.com/2020/06/juladenerowokoxafe.pdfIn PDF document text
    • https://tavobav.files.wordpress.com/2020/06/59451945258.pdfIn PDF document text
    • https://basopejimip.files.wordpress.com/2020/06/wutidafolefa.pdfIn PDF document text
    • https://xudoliposi.files.wordpress.com/2020/06/39617060581.pdfIn PDF document text
    • https://majojilidib.files.wordpress.com/2020/07/lizobakumogod.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_off000071e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71E2 5652 bytes
SHA-256: 3626a8c04d092580c6f08ed668543920715b74878ba1622880ab3f46591ece7b
font_01_sfnt_off00008509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8509 9768 bytes
SHA-256: 4de959a9d601eb630f71a6981c6fa68781d466b79bd63bb93e37c9b5ef423122

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