Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d6f97afd0dc309b…

MALICIOUS

PDF

47.2 KB Created: 2020-08-30 07:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7992dc169916b5c615fc8ffbd42960b SHA-1: 67c78af184f7247f186851d1e2f11b6ff829045f SHA-256: 5d6f97afd0dc309bb9f1f41a73e79adb9d7e5506695bec59e2d470df4f1ea8ec
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, one of which, 'https://ttraff.ru/wix?keyword=motion+graphs+and+kinematics+worksheet', is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain educational content, suggesting a lure. The presence of numerous external PDF links, many pointing to benign content, indicates a link farm strategy. 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.ru/wix?keyword=motion+graphs+and+kinematics+worksheet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/9904c2_f2998f5f6bf440e1b8bd3dd7e9c7f9b4.pdf
    • https://static.usrfiles.com/ugd/7d1dc9_7b47242b741241ff9c35dffbc3a410db.pdf
    • https://static.usrfiles.com/ugd/b8c837_ae2353dbd8ff440390744f326616ca06.pdf
    • https://static.usrfiles.com/ugd/3b47cb_24300f5ccf3446f1a66dccbb7af1c45c.pdf
    • https://cdn.shopify.com/s/files/1/0432/9819/3573/files/3495954263.pdf
    • https://cdn.shopify.com/s/files/1/0437/4151/1834/files/zafado.pdf
    • https://cdn.shopify.com/s/files/1/0429/5560/4121/files/95406118934.pdf
    • https://cdn.shopify.com/s/files/1/0435/1816/5144/files/mezanamawarolelulifazas.pdf
    • https://cdn.shopify.com/s/files/1/0428/7863/2095/files/calendario_escolar_sep_2020_20.pdf
    • https://static.usrfiles.com/ugd/b8c837_1314c5e26b3f4a2b8d6559bc7f3751e8.pdf
    • https://static.usrfiles.com/ugd/d2751c_e3e45516ab66410e8571400b61ff9920.pdf
    • https://static.usrfiles.com/ugd/455f95_207902dcd4da4b78a8c2e22e03c84fc4.pdf
    • https://static.usrfiles.com/ugd/724bd4_b7ed8e17ba3a4a46b2bf1394bed7ea2e.pdf
    • https://cdn.shopify.com/s/files/1/0431/7439/6063/files/aarakshan_movie_video_song_in_hd.pdf
    • https://cdn.shopify.com/s/files/1/0431/1737/9745/files/33791435584.pdf
    • https://cdn.shopify.com/s/files/1/0431/1931/3062/files/kayla_itsines_bikini_body.pdf
    • https://cdn.shopify.com/s/files/1/0434/2313/7957/files/75363600219.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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006dbe.bin
cb76ec87316d448fed03fc2156e02ba08999f2d36bf8fa1d40926236ebada299		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DBE 5404 bytes
font_01_sfnt_off00008008.bin
8e61b17db5b87f1de385441a5c092c278445335f8018eed95cca9dbae9230e07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8008 9880 bytes
font_02_sfnt_off0000a14f.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA14F 4324 bytes

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