Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc120bdf5b28cad…

MALICIOUS

PDF

54.5 KB Created: 2020-09-02 01:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 945037efe0e5781a3597f04e085b58e3 SHA-1: 7766e2f843efefefb81510bf9148f1a0b28027cf SHA-256: 5fc120bdf5b28cade78ad47716272d1a87d4e03d0993d9b12e1145fbcb37c1c9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text related to 'boxing games offline apk' and a URL that is part of a link farm, suggesting a phishing or scam attempt. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=boxing+games+offline+apk
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1058/0902/files/wuzoditufuja.pdf
    • https://cdn.shopify.com/s/files/1/0431/6246/8503/files/duxajibe.pdf
    • https://cdn.shopify.com/s/files/1/0463/1239/0821/files/betternet_vpn_free_for_windows_8._1.pdf
    • https://cdn.shopify.com/s/files/1/0434/1723/9704/files/chamberlain_garage_door_opener_remote_953cd_manual.pdf
    • https://static.usrfiles.com/ugd/b8c837_61dc039615f94bcd81525e48d6b394d8.pdf
    • https://static.usrfiles.com/ugd/f55bec_990d5a10a1f8415296f701c2755be19f.pdf
    • https://static.usrfiles.com/ugd/2ac701_7ac954f7aea8465c8b041e0d764991d8.pdf
    • https://static.usrfiles.com/ugd/b8c837_3be500aae3ec4f30908e389f6d583f57.pdf
    • https://static.usrfiles.com/ugd/834936_2d1331ffe06e4ba4b7aceb1f85a53941.pdf
    • https://static.usrfiles.com/ugd/2ac701_41f1984c571d4e07a97b4af9a6cd057c.pdf
    • https://static.usrfiles.com/ugd/b8c837_0ed4e5c9e25a441da7a1e67086ae9b1a.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006de1.bin
3a2694508cbf4b19e61b213020c91cecffb732a1eb94aaf070505ca6cc34fe9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE1 5304 bytes
font_01_sfnt_off00007fef.bin
d33d11f1ed5a13db730c96e22d98b9fca10d498f4f974fa8bef7b6b80606ed0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FEF 9000 bytes
font_02_sfnt_off0000920c.bin
6a73de4abea0c58308e2628e59719da7a9f51799ca82da6ccb5a0c6568917ca3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x920C 10464 bytes
font_03_sfnt_off0000b62f.bin
e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB62F 16092 bytes

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