Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79db129cf8c8d1f…

MALICIOUS

PDF

41.9 KB Created: 2020-07-08 19:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: 576652a08955b4a3b4d8db7463b3c37b SHA-1: 854048ccf7db829918eaac2c2442fff8175e46d6 SHA-256: c79db129cf8c8d1f8c2ff4d2237ba266cd636e5c035f97518d7f7ddc15f4f683
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 suspicious domains and appear to be part of a link farm designed for SEO poisoning. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains the same suspicious URL found in the heuristics, reinforcing the malicious intent. 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=housecroft%20sharpe%20quimica%20inorganica%20pdf In PDF document text
    • http://files.ncam.ac.nz/uploads/1/3/0/7/130776788/a94fe6a1c2f25a.pdfIn PDF document text
    • http://files.britefulbiz.com/uploads/1/3/0/9/130969718/jelab.pdfIn PDF document text
    • http://files.elevenbees.com/uploads/1/3/1/3/131398281/mitatito-namat-fovexenopekomig-lusuxa.pdfIn PDF document text
    • http://files.enfieldjolf.org/uploads/1/3/1/1/131164418/bigebovonozi.pdfIn PDF document text
    • http://files.zoepantinjewelry.com/uploads/1/3/1/4/131406433/tilirovog_fibamujuv.pdfIn PDF document text
    • http://files.cuestacollegerodeo.com/uploads/1/3/1/4/131483550/f518ae417.pdfIn PDF document text
    • http://files.focusedlearningsolutions.com/uploads/1/3/1/6/131636990/49d8e9.pdfIn PDF document text
    • http://files.gilliantorckler.com/uploads/1/3/0/8/130874629/gomenevidi-kinepowa-xasokipa-xupuzateseroji.pdfIn PDF document text
    • http://files.victoriacoombsbowen.com/uploads/1/3/0/9/130969485/0f6847.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://pixudefixig.files.wordpress.com/2020/06/53593868462.pdfIn PDF document text
    • https://wifuxew.files.wordpress.com/2020/06/mufodo.pdfIn PDF document text
    • https://taxoloxud.files.wordpress.com/2020/06/vekajoledesiluzufoxapod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89462818099.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bewewolifokolugetu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mipin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/baludugosutagaxoreforodul.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_off00006451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6451 5508 bytes
SHA-256: 8b0b8a18c674afbe88e737ce059715a31c63c68b853fd25d7dab0e6b14fc1022
font_01_sfnt_off000076dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76DD 10404 bytes
SHA-256: 36034294ad8e3508146fb9a21c0e8cb259b63f57ff84c1600e7bef81e507b2b7

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