Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b4fece4395f95e9…

MALICIOUS

PDF

68.9 KB Created: 2020-08-10 00:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7f7c358631fe813367f497033e7add3 SHA-1: fd0a0e48aec3adbdc653bf70d791ff96d9aad648 SHA-256: 0b4fece4395f95e9760cb217b309059faf16dedd07de4ba45b900bfe90407395
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to what appears to be a link farm, with one critical link identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to translation services, likely intended to deceive users into clicking the malicious link. The ML classifier strongly supports the malicious verdict.

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=traduccion+de+ingles+a+espa%25C3%25B1ol+pdf
    • http://files.impeachtrumprun.com/uploads/1/3/2/6/132681474/7afb8d0cb8bff6.pdf
    • http://files.iancleggwalsh.net/uploads/1/3/1/3/131384468/nibexiwe.pdf
    • http://files.flyovercountryscribe.com/uploads/1/3/0/7/130776180/wapojevikuxaluvuju.pdf
    • http://files.preisendorfer.net/uploads/1/3/2/3/132302710/fb6b6843e60ba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/3030/5175/files/76781674213.pdf
    • https://cdn.shopify.com/s/files/1/0429/7395/4204/files/fuxewalesifotuwidudegebo.pdf
    • https://cdn.shopify.com/s/files/1/0440/8714/8709/files/lazadikel.pdf
    • https://cdn.shopify.com/s/files/1/0435/6780/8667/files/sopoketejagedowefalikesug.pdf
    • https://cdn.shopify.com/s/files/1/0433/4927/8875/files/geographical_information_systems_and_science_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/4398/7361/files/bogokuz.pdf
    • https://cdn.shopify.com/s/files/1/0437/8080/0674/files/nsfw_discord_rooms.pdf
    • https://cdn.shopify.com/s/files/1/0432/6182/1083/files/majajikirokotesolesu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6300/8664/files/livre_affirmez_vous.pdf
    • https://cdn.shopify.com/s/files/1/0431/7665/7051/files/74001055120.pdf
    • https://cdn.shopify.com/s/files/1/0433/9708/7390/files/95867316126.pdf
    • https://cdn.shopify.com/s/files/1/0433/9744/7831/files/english_verbs_word_search.pdf
    • https://cdn.shopify.com/s/files/1/0429/1539/7788/files/timken_needle_roller_bearing_catalogue.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000de51.bin
73482e9d90ef12b70e79b780da3244f0f399d48b46616a5b00d27da76e103b14		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDE51 21696 bytes
font_00_sfnt_off00009292.bin
63d32d96f522ac9f7024f5949aa9c2be2454db4bb371d290bd4dcfb5e983cc24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9292 3844 bytes
font_01_sfnt_off0000a00b.bin
947af9f43341d5cdda4167b9478432be9d45385f7bcc6843cd08e140678f2070		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA00B 5484 bytes
font_02_sfnt_off0000b280.bin
d9fc4c52e206d6ebf8704388971efc2543b8e13f3d9c4987cf81dab05c23ac62		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB280 13364 bytes

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