Malicious PDF — malware analysis report

Static analysis result for SHA-256 caa27c5a01365cb0…

MALICIOUS

PDF

67.7 KB Created: 2020-08-31 17:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3fbbe021c9993d63c16f9c8b48363354 SHA-1: 6e6dd921d8fe3fc55d8b40b88c68bdeb4bb8747a SHA-256: caa27c5a01365cb0e6656a8eeca40bd90c151a3d7041a5fa3f50f8d83007d04f
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily corrupted, contains text suggesting a lure for a 'britannica arabic english dictionary apk'. This indicates a social engineering attack aiming to trick users into visiting a malicious URL. The presence of a mass external PDF link farm further supports the malicious intent.

Heuristics 3

  • 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.
  • 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/wix?keyword=britannica+arabic+english+dictionary+apk
    • https://static.usrfiles.com/ugd/b8c837_4d9a077fd06d433392c193ee7a9845e5.pdf
    • https://static.usrfiles.com/ugd/d775a9_0c61ff7f100549b9a17ee7324a53f7a9.pdf
    • https://static.usrfiles.com/ugd/b8c837_3849cf880a9d411e869eb4303ccdca74.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce1e48244c014206ba6b39bce20c7902.pdf
    • https://static.usrfiles.com/ugd/b8c837_4c6641363833409b82816d758d0509e3.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lajuvifubukakevo.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0821/files/tabalaganobobel.pdf
    • https://cdn.shopify.com/s/files/1/0466/8896/0676/files/biology_incomplete_and_codominance_w.pdf
    • https://cdn.shopify.com/s/files/1/0437/8047/2984/files/bernard_werber_books_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0439/2324/3176/files/california_physical_science_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0433/6553/1806/files/ragexa.pdf
    • https://cdn.shopify.com/s/files/1/0433/8358/6974/files/99615949479.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000e40b.bin
87afbade419c63ab477ba4f7cbbcc763d31a69ca56c40c56f25d2238c276dbd9		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE40B 18684 bytes
font_00_sfnt_off00009e99.bin
39fb09bfa18227f7220de00135562efddbb651d67d161cfc2c17fca95d49f709		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E99 3744 bytes
font_01_sfnt_off0000abd8.bin
a2e57cb819e8fff59f7b04fb1498db46d9b4a8f138835b41a67ea31b2f31db4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABD8 5692 bytes
font_02_sfnt_off0000bf28.bin
43d6c1f1f7e8850ac3d541ef98c8222cb07f7177ffd06eb55cd2f804bb7a1ea1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF28 10740 bytes

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