Malicious PDF — malware analysis report

Static analysis result for SHA-256 f433646456c8e04e…

MALICIOUS

PDF

37.1 KB Created: 2020-08-27 14:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7153340ff8af6065ba7c8b1e21cee9e SHA-1: f968af8f97b1e5df1f85c2e838fa327dfbd3d62b SHA-256: f433646456c8e04ed8a0d8dad4558ea011379f5b041e2cd67ddd0a91ecac3459
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, includes the text 'Stalked by my patient' and the malicious URL, suggesting a lure to a phishing or malware-hosting site. The presence of a large link farm further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/pify?keyword=stalked+by+my+patient
    • http://files.education-4-change.org/uploads/1/3/1/6/131606094/denaba.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/lipup.pdf
    • https://cdn.shopify.com/s/files/1/0470/6477/6872/files/82665113289.pdf
    • https://cdn.shopify.com/s/files/1/0431/4211/9592/files/betajobas.pdf
    • https://cdn.shopify.com/s/files/1/0429/6821/9799/files/suvunagizasukizijikefipom.pdf
    • https://cdn.shopify.com/s/files/1/0434/2244/9820/files/proper_noun_examples_list.pdf
    • https://cdn.shopify.com/s/files/1/0437/8312/7191/files/jurnal_akuntansi_sektor_publik_2015.pdf
    • https://cdn.shopify.com/s/files/1/0429/5937/2439/files/25244342720.pdf
    • https://cdn.shopify.com/s/files/1/0431/9910/3136/files/5996585452.pdf
    • https://cdn.shopify.com/s/files/1/0433/5783/1336/files/amplified_bible_amp.pdf
    • https://cdn.shopify.com/s/files/1/0434/5161/3336/files/call_upon_the_lord_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/5414/5444/files/penone.pdf
    • https://cdn.shopify.com/s/files/1/0428/6332/9446/files/wumidixek.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000053ac.bin
6eb983e1358e9081eaad7dbc4064b8777af78a59b83fb92d83613e410ecc2e7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x53AC 5240 bytes
font_01_sfnt_off0000656d.bin
a01439e1822fdbc38ed98a1d6b273d8def5a951b50cbd66fa140c196ae4c9f4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x656D 10192 bytes