Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e365a09436e7d08…

MALICIOUS

PDF

58.7 KB Created: 2020-08-22 14:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df0fc28ee423abf30946d81d1fef3ed2 SHA-1: 70930d430fc8b7c957bcfdc19d19382e4950bd07 SHA-256: 6e365a09436e7d08e43dea73b5d4fa8e1afba2e3a21be3818365bbdf17f002ac
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, with at least one pointing to known malicious redirector infrastructure (ttraff.com). The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting an attempt to manipulate search engine results or distribute content through a link farm. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, but the presence of malicious links is the primary indicator of compromise.

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=arijit+singh+sad+song+2019
    • http://files.xchaintechnology.com/uploads/1/3/1/0/131070402/vixobojumanulaj_judonufudef_jusipifulapu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0438/4679/5424/files/derirutenojidupose.pdf
    • https://cdn.shopify.com/s/files/1/0427/6027/4087/files/tusabepatadudojapasuse.pdf
    • https://cdn.shopify.com/s/files/1/0429/7061/1861/files/8895663945.pdf
    • https://cdn.shopify.com/s/files/1/0430/6475/4325/files/39165274251.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/surorut.pdf
    • https://cdn.shopify.com/s/files/1/0431/2550/6208/files/12140921115.pdf
    • https://cdn.shopify.com/s/files/1/0432/6385/2712/files/28392183374.pdf
    • https://cdn.shopify.com/s/files/1/0433/4593/6534/files/kawivefabojisaxosame.pdf
    • https://cdn.shopify.com/s/files/1/0436/2164/6498/files/57179503055.pdf
    • https://cdn.shopify.com/s/files/1/0431/4952/5156/files/19577812474.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006835.bin
f43be54b76894ae9051705ca92809952fbfb14d9867b2e88c0ebb27f5cba8187		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6835 5600 bytes
font_01_sfnt_off00007b2a.bin
7f9d240badee839b1f3ddfa1755007e046857b083d5881801628d5f766eec120		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B2A 2200 bytes
font_02_sfnt_off0000856e.bin
9aad77d4dc7c13d537210df2b80a3129ee0ebcd13157f7ad8789ebbaaeeb2eb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x856E 13568 bytes
font_03_sfnt_off0000b026.bin
e5458d7b6d82539349b17fc4713a17e1381d471255c72d9f8116b7c86e08c443		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB026 16168 bytes
font_04_sfnt_off0000c567.bin
1790911131471a32474ea5fa53b26b8e274101af6c3b03a9c1d13f84638d8d2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC567 6664 bytes

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