Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc605eef30e5c8f…

MALICIOUS

PDF

44.4 KB Created: 2020-09-01 02:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f75cd75708e9cc8b9df146ac1fe09d0a SHA-1: 9c83fa1ea7715d08000082bff41fff8e4f1c013b SHA-256: ecc605eef30e5c8ff8c7a982cc8d26c4a3678b61eb06fe02f05d93b342e83edd
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=free+printable+attendance+sheet+for+teachers'. The document body, though heavily obfuscated, also contains this URL and numerous other links to external PDFs, suggesting a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves luring the user to a malicious site via a seemingly innocuous document.

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=free+printable+attendance+sheet+for+teachers
    • https://static.usrfiles.com/ugd/b8c837_d5275f14275f4be9b28eedb7b2fde6de.pdf
    • https://static.usrfiles.com/ugd/917232_5a245a9cd939465fa07d250b82f0be96.pdf
    • https://static.usrfiles.com/ugd/6cfc61_a0f3115c3c944536abaefea98f87b644.pdf
    • https://static.usrfiles.com/ugd/2f7815_c5f798b6135346ed830cefab2e01323b.pdf
    • https://cdn.shopify.com/s/files/1/0437/3846/4417/files/30973282600.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/88203749733.pdf
    • https://cdn.shopify.com/s/files/1/0439/2720/8091/files/scarlett_2i4_manual.pdf
    • https://static.usrfiles.com/ugd/2b25b5_58c0168007024fee80ac9de6629496f9.pdf
    • https://static.usrfiles.com/ugd/b8c837_a6210fa0add848b795733c8bad17d172.pdf
    • https://static.usrfiles.com/ugd/c5d40f_ea9b7647812f4e15a879322962648dac.pdf
    • https://static.usrfiles.com/ugd/9374a7_e6dff9830ea842958a22de233952ce5e.pdf
    • https://static.usrfiles.com/ugd/8b4172_7f7a5dd53a1349c49ca407b137fc01f4.pdf
    • https://cdn.shopify.com/s/files/1/0434/9899/5864/files/fekewaxadese.pdf
    • https://cdn.shopify.com/s/files/1/0431/0319/1194/files/lima_barreto_lilia_schwarcz.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6537/files/sf2_polar_or_nonpolar.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_off0000626e.bin
6c617ae34b05c79c25722f9cfdc582b7c96cd08098d8e657e97b395f27699971		 pdf-font-stream PDF embedded font (sfnt) at offset 0x626E 5128 bytes
font_01_sfnt_off000073bb.bin
808c30b7579ea3d0bba51795416622369ab41d9023c081f23b95cb05704c9ddd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73BB 10128 bytes
font_02_sfnt_off00009663.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9663 4324 bytes

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