Malicious PDF — malware analysis report

Static analysis result for SHA-256 2635264435c1bba9…

MALICIOUS

PDF

44.9 KB Created: 2020-08-27 13:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10f9a32b2a7116aac748423ec92dd6ad SHA-1: 84d22f1175e79c0be72f3930d3da21adfa07bfb4 SHA-256: 2635264435c1bba9fb671cc56cae1c63748ad17b14f04eda7809cd55287dd947
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific malicious redirector URL, indicating a lure to a malicious site. The document body, though heavily obfuscated, contains text related to a 'Toyota 7hbw23 manual' and the malicious URL, suggesting a social engineering pretext. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=toyota+7hbw23+manual
    • http://vomegised.spanishkc.com/uploads/1/3/2/6/132683289/34e19a773b93a10.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7318/files/siwem.pdf
    • https://cdn.shopify.com/s/files/1/0432/3550/8392/files/74665081298.pdf
    • https://cdn.shopify.com/s/files/1/0434/4040/6684/files/wunadamimiwesavakov.pdf
    • https://cdn.shopify.com/s/files/1/0433/4164/3928/files/58065878316.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nedodakamilutejevojive.pdf
    • https://cdn.shopify.com/s/files/1/0463/4869/7757/files/3193888757.pdf
    • https://cdn.shopify.com/s/files/1/0430/5354/7677/files/dresden_files_rpg_paranet_papers.pdf
    • https://cdn.shopify.com/s/files/1/0460/1502/1223/files/ardaas_2016_full_movie_filmywap.pdf
    • https://cdn.shopify.com/s/files/1/0428/8030/3267/files/wii_lego_star_wars.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a4e.bin
a5d2dead583c93da3b023961e66106b6fd5f4daae4c4a8077212af22a8fcbe76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A4E 5024 bytes
font_01_sfnt_off00006b59.bin
afa75cb0d38dbbf3e903d2f83d9bc4c7b45bf617a990da6d38aba1695cc7eb7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B59 14636 bytes
font_02_sfnt_off0000993b.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x993B 4324 bytes

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