Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab53a05974131f37…

MALICIOUS

PDF

59.2 KB Created: 2020-09-09 11:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6f85566105471d094a190d80367854b SHA-1: 544fe679342e464376706bcbe41a01f41644463c SHA-256: ab53a05974131f377c9a946d948d59890ba2eefc0b50d61b63d0f34c276bf289
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and contains a significant number of embedded links, many pointing to external PDFs. One critical heuristic identified a link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL for the redirector, suggesting an attempt to lure users to malicious infrastructure.

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.me/pify?keyword=nothing+holding+me+back+song
    • https://static.usrfiles.com/ugd/33c377_a2fe850c15b24b62a5b9d79342accbca.pdf
    • https://static.usrfiles.com/ugd/48f461_ba0ffa3cedb448acac63a8eb13c897b1.pdf
    • https://static.usrfiles.com/ugd/ee4a13_3ecd5260ed6d407dbd13a04bee19691f.pdf
    • https://static.usrfiles.com/ugd/f1d680_f63c2d630ee945449773378fd6daf61b.pdf
    • https://static.usrfiles.com/ugd/50de67_e0af07040856495ea4727bd59a0e783a.pdf
    • https://cdn.shopify.com/s/files/1/0429/5956/9055/files/79948983971.pdf
    • https://cdn.shopify.com/s/files/1/0432/3088/8094/files/76675772441.pdf
    • https://static.usrfiles.com/ugd/ac72e0_0d90bca1b9394a938d75d031af5ff5bf.pdf
    • https://static.usrfiles.com/ugd/aef5b7_d7320852977a49f5a55375182784b6dd.pdf
    • https://static.usrfiles.com/ugd/0b46e6_17fc5e6c6ad24909a16f60efe7ed562b.pdf
    • https://static.usrfiles.com/ugd/16a96a_b0bfc5efc0f24ddca6789ba3daa36588.pdf
    • https://cdn.shopify.com/s/files/1/0439/0263/2104/files/38273042554.pdf
    • https://cdn.shopify.com/s/files/1/0462/3774/5303/files/memazefafomesi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7355/8935/files/history_of_bhatti_caste_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0437/5294/7873/files/alita_battle_angel_tamil_trailer.pdf
    • https://cdn.shopify.com/s/files/1/0438/3866/8965/files/33545139602.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_off00009363.bin
fb57bf7fd8ce8562866c15edf60588ca5e90bee099119698d46ac69292479791		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9363 3276 bytes
font_01_sfnt_off00009f3b.bin
cff6daee786771edaf8b6a4893cb60194ba40f095e033acf5084b823829a9e1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F3B 5432 bytes
font_02_sfnt_off0000b191.bin
8fe099fc7fc17c04f7297a8d3d8818803092d8a453481ffce14385160b2bb4dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB191 15036 bytes

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