Malicious PDF — malware analysis report

Static analysis result for SHA-256 803d69205aa81450…

MALICIOUS

PDF

54.9 KB Created: 2020-11-07 06:45:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 20466590c34ac53753c18f0772e6ac01 SHA-1: 9bfa7177ce5acf7d783a6b50b5eb202d10be4a7e SHA-256: 803d69205aa814503dd2142878d9dc9d969b21c7f3dd103ff14dbda7aead9838
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified as a link farm, with many pointing to disposable hosting. One of the primary links is to 'traffine.ru', suggesting a potential SEO manipulation or traffic redirection scheme. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent behind the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffine.ru/123?keyword=lady+deathwhisper+guide+hearthstone PDF link annotation
    • https://varivupe.weebly.com/uploads/1/3/4/4/134480773/9065364.pdfIn PDF document text
    • https://tebixuku.weebly.com/uploads/1/3/4/5/134595315/kaneve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391331/normal_5f9c0669d23ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372384/normal_5f9313902e115.pdfIn PDF document text
    • https://kozitasulama.weebly.com/uploads/1/3/4/6/134647404/6578979.pdfIn PDF document text
    • https://dufejubodumafeb.weebly.com/uploads/1/3/4/4/134444341/9349257.pdfIn PDF document text
    • https://tenikekiso.weebly.com/uploads/1/3/0/7/130775729/xomepurapupuwume.pdfIn PDF document text
    • https://wafulerafi.weebly.com/uploads/1/3/4/5/134503758/voxametuvumibepuzi.pdfIn PDF document text
    • https://nijubalalo.weebly.com/uploads/1/3/1/4/131453980/5849346.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/naranofinovujix/homemade_reverse_osmosis_maple_sap.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/past_simple_and_present_continuous_exercises.pdfIn PDF document text
    • https://lavukiju.files.wordpress.com/2020/11/15987205006.pdfIn PDF document text
    • https://junevip.files.wordpress.com/2020/11/bewunomofilase.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_off0000977a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x977A 5324 bytes
SHA-256: 7c1ab421270b5cfe52f4a1512008adf333887cc739203df3b960d4c64e00d866
font_01_sfnt_off0000a9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9AC 10832 bytes
SHA-256: 9062d1251b10827376a094f3ab4cfd22528ce92c32fc10c32a209d250f3d70c5