Malicious PDF — malware analysis report

Static analysis result for SHA-256 af74b53b0928ed2d…

MALICIOUS

PDF

43.1 KB Created: 2020-08-11 15:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8895603a6db66c15561f3022dcdec50 SHA-1: cae408fe626d1e0c0c439075c459c5266afae3de SHA-256: af74b53b0928ed2d79c6ce19c1afb1214757a00dd889e302360fcfd873c4bd11
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.ru) known for malicious activity. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are part of this link farm, suggesting the primary purpose is to redirect users to potentially harmful content, possibly for SEO poisoning or 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://ttraff.ru/pify?keyword=algebra+1+statistics+worksheets+pdf
    • http://files.fasdxservices.com/uploads/1/3/0/8/130873708/gifajitumowo-gativa.pdf
    • http://files.stevenleeweintraub.com/uploads/1/3/2/7/132740685/guzikopugop-noxilix.pdf
    • http://files.uucsarasota.com/uploads/1/3/2/7/132740267/49381f.pdf
    • http://zolipofa.blackkitchen-blog.com/uploads/1/3/0/9/130968984/5330ba.pdf
    • http://zidivaj.verdancecreations.com/uploads/1/3/1/4/131437615/ffe080fcbecafe.pdf
    • https://cdn.shopify.com/s/files/1/0431/4392/1820/files/wiripuzajisozi.pdf
    • https://cdn.shopify.com/s/files/1/0433/2965/0856/files/tejolefaki.pdf
    • https://cdn.shopify.com/s/files/1/0432/1627/3563/files/rewibajebiwefaxofuwupog.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/85970378463.pdf
    • https://cdn.shopify.com/s/files/1/0438/4171/6389/files/kufizovamevutolaxudima.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43034806536.pdf
    • https://cdn.shopify.com/s/files/1/0430/4722/3458/files/zaguwezotalufomukim.pdf
    • https://cdn.shopify.com/s/files/1/0430/6305/0394/files/blue_rondo_a_la_turk_dave_brubeck.pdf
    • https://cdn.shopify.com/s/files/1/0440/8056/2326/files/common_size_balance_sheet_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0449/0467/7543/files/boundary_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/0256/8599/files/tonisazirofof.pdf
    • https://cdn.shopify.com/s/files/1/0429/6117/4684/files/wenanomuzusawuvogap.pdf
    • https://cdn.shopify.com/s/files/1/0449/4082/0635/files/belebajeb.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_off000068b6.bin
29b6544c59f949426bc2e13057ebc5bfd078b3131485cb4c3469c453dda2e778		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68B6 5756 bytes
font_01_sfnt_off00007c4e.bin
9e25d5d6d9a12cde2df3835182d2add785d408e2cad6d4acd84c0c8532559187		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C4E 10204 bytes

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