Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f45e527e7dd564…

MALICIOUS

PDF

40.7 KB Created: 2020-10-31 12:41:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9342890e209cee50e18222cb514f0102 SHA-1: 1202f30a36c9e4fafd4be20cf4c77ab18c616b0f SHA-256: f7f45e527e7dd56400d72c9f19f71814d4d0fa3f6452a6ae66873ecf34498b81
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by an ML classifier and contains a significant number of embedded links. One of these links, https://gettraff.ru/aws?keyword=dictionary+in+lieu+of, points to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL, suggesting its primary purpose is to redirect users to potentially harmful websites, likely for SEO poisoning or phishing campaigns.

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://gettraff.ru/aws?keyword=dictionary+in+lieu+of In PDF document text
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/7715375.pdfIn PDF document text
    • https://nixejovebomir.weebly.com/uploads/1/3/1/3/131380485/subevabimofa_livogexe.pdfIn PDF document text
    • https://gofobodobade.weebly.com/uploads/1/3/4/4/134444694/4790582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375896/normal_5f8cbf67619da.pdfIn PDF document text
    • https://megeleju.weebly.com/uploads/1/3/4/3/134319984/8498870.pdfIn PDF document text
    • https://nujidigazinuwag.weebly.com/uploads/1/3/4/3/134318548/gotususedavidiwojuto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372987/normal_5f94bea5b8ce8.pdfIn PDF document text
    • https://lilawowawumoxo.weebly.com/uploads/1/3/1/4/131453384/635967.pdfIn PDF document text
    • https://kejijasorakabil.weebly.com/uploads/1/3/4/3/134311956/6d23bce78.pdfIn PDF document text
    • https://jinunezig.weebly.com/uploads/1/3/4/3/134308797/deriduwole.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3441/8586/files/zoduju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48e62b5b-7d23-41de-bd3a-4cdf001abe00/rolupagewirisijawiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/4295/3154/files/45361590330.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6329 4800 bytes
SHA-256: b113302a4402c77542aa386ca3fd98e5f646515b5313e9c8a54e53f53909149c
font_01_sfnt_off0000739e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x739E 10192 bytes
SHA-256: c7fa5ab0df9de60151f692cc9e74aeeedcbf66b0f3822e86c6df2f4e4e2991de

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