Malicious PDF — malware analysis report

Static analysis result for SHA-256 563a70b3d27d3166…

MALICIOUS

PDF

55.4 KB Created: 2020-08-07 02:39:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 395d4bde296cbf0157d7b390aa6970ce SHA-1: 7d5ca12cfbdc544ec769e30126f1aa9c7456f692 SHA-256: 563a70b3d27d31660ffa84eb57dfbe3cac69c4df19f5e548528369df63765271
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though partially corrupted, includes text related to 'recruitment notification' and the malicious URL, suggesting a phishing lure. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm used for SEO poisoning or distributing malicious content. The ML classifier also 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.com/pify?keyword=bwssb+recruitment+notification+pdf+download
    • http://files.y4kc.org/uploads/1/3/2/7/132740804/muginil.pdf
    • http://files.polarispsychology.ca/uploads/1/3/2/6/132682076/rutamutoz.pdf
    • http://files.piecedtogether.org/uploads/1/3/1/8/131871740/e2ea772.pdf
    • http://files.thefilamentstudio.com/uploads/1/3/0/7/130739769/wapuwivegub.pdf
    • https://cdn.shopify.com/s/files/1/0433/2729/1544/files/17846371252.pdf
    • https://cdn.shopify.com/s/files/1/0433/2732/4310/files/12825244265.pdf
    • https://cdn.shopify.com/s/files/1/0435/7593/5134/files/migezamobesibumesofes.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9236/files/legasanepofa.pdf
    • https://cdn.shopify.com/s/files/1/0433/2313/0009/files/tozanesabadevub.pdf
    • https://cdn.shopify.com/s/files/1/0431/2019/7789/files/88913053072.pdf
    • https://cdn.shopify.com/s/files/1/0432/3799/8754/files/gunesovujaxasokogojonav.pdf
    • https://cdn.shopify.com/s/files/1/0431/4490/4865/files/tolavek.pdf
    • https://cdn.shopify.com/s/files/1/0434/5282/5767/files/94412433512.pdf
    • https://cdn.shopify.com/s/files/1/0432/1142/3902/files/25598279807.pdf
    • https://cdn.shopify.com/s/files/1/0431/8052/3678/files/birumazopuwijin.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
font_00_sfnt_off000071a4.bin
dfca58bf96462e21fde632c2435d0979375698e2276103f0d5fc9b18e4df2dd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71A4 5580 bytes
font_01_sfnt_off00008496.bin
aaba30921e0a99532974b7424e5c8008c63c71d5379e229e9d5d5bc67bd3f3bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8496 10432 bytes
font_02_sfnt_off0000a83e.bin
e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA83E 16164 bytes
font_03_sfnt_off0000bd91.bin
b058e2cd97bf226c03c4ac1d9208db00b53bddb930e657afa91620a81a47719c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD91 4916 bytes

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