Malicious PDF — malware analysis report

Static analysis result for SHA-256 024d79c06a51c2aa…

MALICIOUS

PDF

47.6 KB Created: 2020-11-03 09:44:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 571935867ec59fb44b86dad6d9529673 SHA-1: eca7f80cc34182688694d2d7048e1bc7186ae933 SHA-256: 024d79c06a51c2aaf38e80482abf4d4f4d1a4ec2f0156249c04abeb4bae95a82
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating a malicious redirector at 'https://ttraff.ru/123?keyword=angle+and+segment+bisectors+worksheet+answers'. Another critical heuristic identified a PDF link farm, suggesting the document is part of a larger SEO manipulation scheme to drive traffic to malicious sites. The ML classifier also strongly indicated maliciousness.

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/123?keyword=angle+and+segment+bisectors+worksheet+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369318/normal_5f93ecb6ecd88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383567/normal_5f9e68d81fd63.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/1/0486/0844/4574/files/quittance_loyer_particulier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8a234fd-312d-4d51-91f7-ce814171b5b1/lisilevikelidudutaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac739fef-82af-4531-a178-eca2e46cc1e2/71758941344.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb1abaa2-7788-4cf5-8e1c-4626a28cf6d4/poritilexojebiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/6657/1975/files/abs_plastic_repair_kit_home_depot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98252299-16f6-4705-a288-16e5ffebdc56/gojugesixakadujasutet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/2178/5026/files/23127211979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d051dba-28ab-4cef-880d-94117e7fd7ba/60551379575.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ba6139e-0bc9-422b-ac09-d0a30dcf5e62/jiwovudozeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3abb1b1-8070-4446-8d5c-246ccbeb6223/xorabuvazaxot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfb99569-ba0d-4b59-a98b-0d1457c3ec4b/public_transport_simulator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a05f42e-0f77-4594-93f0-06a801b21588/instructions_for_keurig_mini_plus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e6925b0-2fbf-4d1d-ac8d-b8fa1b738463/oraciones_subordinadas_adverbiales_propias_ejercicios_resueltos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/6975/6342/files/43146137274.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6362 5640 bytes
SHA-256: 2260e3d6d9f6673692d7fee43d73c22b64014a1eb61efb53a3d49de4b799c8f9
font_01_sfnt_off0000767c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x767C 11212 bytes
SHA-256: 640747fbcd55ce2b327d3d2c1490bd29cc74744ce4728589ad5833af320c55a7
font_02_sfnt_off00009c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C87 16072 bytes
SHA-256: 24c5c481937acf4f4841e6563a6d7a18cfdb810806c94b09ac0ff4033348c1e6

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