Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ff562443e98999…

MALICIOUS

PDF

39.4 KB Created: 2020-09-01 06:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f28d3924abdb565049f1334ccda28cf5 SHA-1: afbd4e6fb1bf5b93f402180f530b4806525bcb46 SHA-256: f9ff562443e98999295a24888d92cf3d79d9130bf10eb54ac45f8104b40a952e
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to lure users with search engine optimized content. The document body, though heavily obfuscated, contains the URL https://ttraff.com/wix?keyword=aimp+skins+apk, suggesting a lure related to 'aimp skins apk'. The PDF also contains a link farm pointing to numerous other PDFs hosted on static.usrfiles.com, indicating a potential SEO poisoning or link farm strategy to distribute malicious content.

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=aimp+skins+apk
    • https://static.usrfiles.com/ugd/fe83c3_463c252688bb44ac84be8da80631add9.pdf
    • https://static.usrfiles.com/ugd/db1da1_b5b3998449194ee687f5ad0da75f5d1b.pdf
    • https://static.usrfiles.com/ugd/de3d83_4a9461d3aaac404da51688e6a32e6300.pdf
    • https://static.usrfiles.com/ugd/6f7357_b98d226ded554b0b8bf45849e2bf0160.pdf
    • https://static.usrfiles.com/ugd/b8c837_7eaab494c2c649598140e8a8cbc426e2.pdf
    • https://cdn.shopify.com/s/files/1/0432/2141/8147/files/fisukoxavurijexuru.pdf
    • https://cdn.shopify.com/s/files/1/0437/8473/2829/files/susazilikezamitogifef.pdf
    • https://cdn.shopify.com/s/files/1/0434/1488/0405/files/73496531303.pdf
    • https://cdn.shopify.com/s/files/1/0437/6467/8817/files/addition_of_binary_numbers.pdf
    • https://cdn.shopify.com/s/files/1/0431/1053/1238/files/punctuation_worksheets_for_grade_7.pdf
    • https://cdn.shopify.com/s/files/1/0436/6345/8457/files/87518891743.pdf
    • https://cdn.shopify.com/s/files/1/0428/8849/5270/files/65000496830.pdf
    • https://static.usrfiles.com/ugd/aec2ea_c9ff910599ff4ca1821703e961b45846.pdf
    • https://static.usrfiles.com/ugd/b8c837_f9af000aa86d462abb3dd7bdb27041ae.pdf
    • https://static.usrfiles.com/ugd/5be868_d320d6db88724d0e8e491448df5aa1a7.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_off00004b5f.bin
f37b80288fa79abb95401b549a1b8535ff3e69486e5c71839a2ef326d76c87bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B5F 4888 bytes
font_01_sfnt_off00005be8.bin
3b4f81cdaa7b44726c8a9eb1fcf18f478e11f7a76d11411e4911e09b85c4d164		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BE8 6520 bytes
font_02_sfnt_off00006ddb.bin
a121ab81cd5a08118c4e88170fc20a9f785c2ee7adee63f70fcccddff235869e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DDB 9772 bytes

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