Malicious PDF — malware analysis report

Static analysis result for SHA-256 541d7bd538005c33…

MALICIOUS

PDF

47.5 KB Created: 2020-11-03 01:41:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: dd9da140a953380e422289789ba76797 SHA-1: 1a0f2573636aa5210feef492d2c3462e1f7d7944 SHA-256: 541d7bd538005c332890db50f7dcaa1ca8e2ae1cd329a4ad6d83c9ccd7df98f0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one specifically pointing to known malicious redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting an attempt to manipulate search engine results or distribute content through a link farm. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure, likely initiated via spearphishing.

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://gettraff.ru/123?keyword=rvhs+teacher+websites In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382192/normal_5f8ca5108fd9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417653/normal_5f9e2ea0be59c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377908/normal_5f8cc22070dec.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/kavitokolezub/54372341066.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7785/1549/files/mutants_genetic_gladiators_crafting_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e8fccc0-eae6-4772-80b5-26c35c12477c/bolifeg.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/47917709895.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6114/8836/files/ravepuminixozovupadefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a2e92b6-2239-4afc-b983-a757fc9fce8f/14861377931.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4097/6291/files/mazuketubemuguzomebevaxiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7973/8567/files/cantate_domino_heinrich_schtz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/6739/9076/files/street_death_drift_racing_3d_mod_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7511/1586/files/northern_territory_intervention.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2566/4666/files/elder_scrolls_skyrim_special_edition_guide.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_off00007b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B61 5156 bytes
SHA-256: 82da9db898aa0097183bd73c9597be6994181695d1baee0fe8c3716f862f5c57
font_01_sfnt_off00008d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D01 10808 bytes
SHA-256: 6df02bb9faf8f6b9025836fcbee160b96b159d128d8026f61cbd220e2de84dce

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