Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ef628c44a4ccb7…

MALICIOUS

PDF

47.8 KB Created: 2020-08-11 14:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 130afa0f2f2323a5d0388dfdaccf8774 SHA-1: 01f62676801c5d2ef2b09dcc8d4822ad0bfa8308 SHA-256: b5ef628c44a4ccb7b34d5feb1fd3d893df72ff3dd39f740cbace9cc123bf2508
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a link that redirects to a known malicious URL, indicating a phishing or redirection attempt. The document body text, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=227+bodyweight+exercises+pdf', which is also flagged by heuristics as a malicious redirector. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute malicious content.

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.cc/pify?keyword=227+bodyweight+exercises+pdf
    • http://files.daintydande.com/uploads/1/3/2/8/132815748/xefajuxomi-podizuwurez.pdf
    • http://files.allthingsdunham.com/uploads/1/3/0/7/130739510/5015553.pdf
    • http://files.flowerofcarmelhermitage.org/uploads/1/3/0/9/130970022/sutenuj_zukafomuvel_pufibidelekapop.pdf
    • http://files.finddani.org/uploads/1/3/1/3/131379875/zateletaresu.pdf
    • http://files.elizabethdanielledesign.com/uploads/1/3/1/8/131857270/rolewurolovupe.pdf
    • https://cdn.shopify.com/s/files/1/0434/3123/1644/files/gosezanowizesuzowezumezef.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32600433864.pdf
    • https://cdn.shopify.com/s/files/1/0437/4996/5985/files/13695245870.pdf
    • https://cdn.shopify.com/s/files/1/0430/5630/0185/files/23289742144.pdf
    • https://cdn.shopify.com/s/files/1/0427/7207/0556/files/65909017885.pdf
    • https://cdn.shopify.com/s/files/1/0433/6694/0828/files/battleships_movie_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/0098/7801/files/importance_of_globalization.pdf
    • https://cdn.shopify.com/s/files/1/0428/0477/3031/files/95942488129.pdf
    • https://cdn.shopify.com/s/files/1/0427/9848/1564/files/biomedical_model_of_health_strengths_and_weaknesses.pdf
    • https://cdn.shopify.com/s/files/1/0434/6393/4109/files/16416872773.pdf
    • https://cdn.shopify.com/s/files/1/0432/5244/9435/files/5282668823.pdf
    • https://cdn.shopify.com/s/files/1/0431/8140/8416/files/2325829021.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_off00007ae3.bin
1abd2702161ffda251441ee02d4353d5e2350a55c2e82972029111e6d7ff7308		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AE3 5692 bytes
font_01_sfnt_off00008e67.bin
80ac26869036ed739c92826a4bfccf1d2f8a1995ca8b83aa1de7bfe37aee4e21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E67 10388 bytes

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