Malicious PDF — malware analysis report

Static analysis result for SHA-256 34efaeb5e1cccd82…

MALICIOUS

PDF

44.3 KB Created: 2020-09-29 19:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a6dd554080c67c47131a2d4123fd20db SHA-1: e51a382942683961676ca64957c9b8a53ff82f98 SHA-256: 34efaeb5e1cccd827c7e33afc3c2fb1e5fae6b43d1be5d14a43ed75e16fc3ff7
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically `https://cctraff.ru/strik?keyword=balanitis+tratamiento+pdf+2018`. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure the user to a malicious site. The presence of a large number of external PDF links further indicates a link farm or SEO poisoning attempt, likely to distribute malware or conduct phishing.

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://cctraff.ru/strik?keyword=balanitis+tratamiento+pdf+2018 In PDF document text
    • http://pimofusir.sonserae.com/uploads/1/3/0/8/130814085/1260793.pdfIn PDF document text
    • http://tozin.envercreeklibrary.com/uploads/1/3/2/7/132740837/zifatefuwigazoko.pdfIn PDF document text
    • http://files.odonataseaglass.com/uploads/1/3/0/7/130776648/1626315.pdfIn PDF document text
    • http://files.chirpytravels.com/uploads/1/3/1/4/131438741/soxefemipa.pdfIn PDF document text
    • https://site-1037111.mozfiles.com/files/1037111/19521165445.pdfIn PDF document text
    • https://site-1036728.mozfiles.com/files/1036728/19420168049.pdfIn PDF document text
    • https://site-1036681.mozfiles.com/files/1036681/21200303239.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/85192821-cb34-4c6f-9084-da0eff051763/pojomesazebujux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e192c9c-bb24-4890-a5a9-b95577cccf99/wewozatapofobuxux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c3531f9-0de7-4db2-98ac-8c3755f5a4ce/remidukonumugux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4082/3706/files/5260288704.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2535/7210/files/farberware_3.2_air_fryer_reviews.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/3070/8129/files/ridod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3846/6467/files/75402575438.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_off00006e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E3E 5756 bytes
SHA-256: 0b052cc9a33c96aa3bcade02bc1365e25fb3a376882b4c614883fa59678092bc
font_01_sfnt_off000081be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81BE 10140 bytes
SHA-256: 505318f7ae25dcaf99499aaf9d70775af3efbabf682aa91910c667e5d0d40159

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