Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a167fee743e0bec…

MALICIOUS

PDF

40.3 KB Created: 2020-09-01 01:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0654c3f86c78fb350dfaa4010e812ce SHA-1: ec9f36e6e99eec246b075c0c5ad5f9dba1afa00d SHA-256: 9a167fee743e0becdeb67122860e60f94f0dea861e942864fd9963600e7a2042
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains text that appears to be a lure for 'Bematool 64 bits', suggesting a social engineering attack. The presence of numerous external links, many pointing to benign Shopify URLs, indicates a potential link farm or SEO poisoning attempt to mask the malicious redirect.

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.com/wix?keyword=bematool+64+bits
    • https://static.usrfiles.com/ugd/1d64af_db3aa736e65845739e16a850ec5d9718.pdf
    • https://static.usrfiles.com/ugd/3f80ec_78504b22f46d4d3f86897483b64c907f.pdf
    • https://static.usrfiles.com/ugd/8b49c6_386ca457cf6a48c0a4fede7c32e506c6.pdf
    • https://static.usrfiles.com/ugd/599f1c_019a23c3fedf45978f18ed11c403a44c.pdf
    • https://static.usrfiles.com/ugd/73f3b0_37928dc2ce7d47de89e859a0734d6f2e.pdf
    • https://cdn.shopify.com/s/files/1/0432/3137/9618/files/kasiw.pdf
    • https://cdn.shopify.com/s/files/1/0437/7149/4554/files/72694518096.pdf
    • https://cdn.shopify.com/s/files/1/0431/6987/4080/files/rational_numbers_worksheet_grade_8_icse.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/72619586694.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zorosibal.pdf
    • https://cdn.shopify.com/s/files/1/0437/7473/8586/files/80675398433.pdf
    • https://cdn.shopify.com/s/files/1/0430/4073/5381/files/leboxorewe.pdf
    • https://cdn.shopify.com/s/files/1/0438/8909/8907/files/corsair_void_pro_mic_not_working.pdf
    • https://cdn.shopify.com/s/files/1/0434/7294/5304/files/1421217785.pdf
    • https://cdn.shopify.com/s/files/1/0462/3820/4053/files/logros_y_avances_en_los_procesos_pedagogicos.pdf
    • https://static.usrfiles.com/ugd/9dda13_558b5fd214a9408bbf6a86323f3ce665.pdf
    • https://static.usrfiles.com/ugd/81d6a4_f7c8a3fa2a17461a825cffc3ba1b7290.pdf
    • https://static.usrfiles.com/ugd/865d50_69df5ec22ac34befbaa4357e27597d4d.pdf
    • https://static.usrfiles.com/ugd/b8c837_794307b8d8e84c9a8cab8736ac8671bf.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f80.bin
c3c4720bbbdc57d3abcf0045462878534b458f0286cbe7a4ec88d7b1f8995f46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F80 5164 bytes
font_01_sfnt_off000070fd.bin
e115c49f8029c67bc0a121fd0f44089677d7158ded3e695ac2c7dbef6dc07ba5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70FD 10528 bytes

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