Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d2ae0e5f6dce74…

MALICIOUS

PDF

40.4 KB Created: 2020-10-15 08:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 13dbf6e99e669d1863693ef98cac23fa SHA-1: ea63654c89428fa4030b004c4c92772a774db8dc SHA-256: b8d2ae0e5f6dce747cf432ce7e9da2e4718b923d49500fa48120e5b4fbcfd6fb
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to disposable hosting services and redirect to potentially malicious domains. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a link to 'ggtraff.ru' as malicious. This indicates a link farm or SEO poisoning tactic designed to drive traffic to malicious infrastructure, likely for further exploitation or phishing.

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://ggtraff.ru/123?keyword=phrasal+verbs+separable+and+inseparable+exercises+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365601/normal_5f8712369f939.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_5f87445c3bca4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366402/normal_5f87cfa0c7c79.pdfIn PDF document text
    • https://site-1038830.mozfiles.com/files/1038830/polipokojevuli.pdfIn PDF document text
    • https://site-1038351.mozfiles.com/files/1038351/83724225363.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5f86f603de166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367294/normal_5f87873c3955f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366639/normal_5f87278f8b3f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5f872edaae49c.pdfIn PDF document text
    • https://pavowojavujide.weebly.com/uploads/1/3/1/3/131398322/3883684.pdfIn PDF document text
    • https://gonerogad.weebly.com/uploads/1/3/1/4/131438616/lovada.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/57d02b5e848c77.pdfIn PDF document text
    • https://povutepumik.weebly.com/uploads/1/3/2/7/132741486/tajokakapuzavil_popolutev.pdfIn PDF document text
    • https://jivexine.weebly.com/uploads/1/3/1/3/131380908/vokuzamik.pdfIn PDF document text
    • https://site-1043134.mozfiles.com/files/1043134/79592187715.pdfIn PDF document text
    • https://site-1042432.mozfiles.com/files/1042432/56593337718.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_5f87607392aa3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365606/normal_5f86f9cc3bfb0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00005fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA6 5512 bytes
SHA-256: 81f6db85d462e95700f4e8e34bb3eb8b73287443d1e909e9103eb2523796049e
font_01_sfnt_off00007255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7255 9920 bytes
SHA-256: a02ed032f2905ab73faafcce117939f692ccc274e39f0e636100c8e0a020a016

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