Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a34deb2a6c6e633…

MALICIOUS

PDF

73.2 KB Created: 2020-08-01 17:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e321420601c1177ab27ae5f6a282566 SHA-1: f32933be6701bfad4d1380001a7695218a273545 SHA-256: 5a34deb2a6c6e633d37459d2c01909f64ae8eb069eaa1696c30e87867b579248
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.com/pify?keyword=git+on+top'. Another critical heuristic identified a PDF link farm with 30 external links, many pointing to benign Shopify domains but also including unknown domains. The ML classifier strongly indicated maliciousness. The document body is heavily obfuscated but contains the redirector URL, suggesting the primary goal is to redirect the user to malicious infrastructure.

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=git+on+top
    • http://files.tt-lt-support-network.com/uploads/1/3/2/8/132814958/9447910.pdf
    • http://files.keepeducationpublic.org/uploads/1/3/0/8/130814601/7561461.pdf
    • http://files.ponyselectbaseball.org/uploads/1/3/2/3/132303170/sesobera_xobiju_nixefuzotezop.pdf
    • http://files.freeindeedreentry.org/uploads/1/3/2/6/132695306/5824015.pdf
    • http://files.redhotyogastudios.com/uploads/1/3/1/8/131857723/felofedako.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/2518/4421/files/6117198981.pdf
    • https://cdn.shopify.com/s/files/1/0434/8539/7152/files/37690340291.pdf
    • https://cdn.shopify.com/s/files/1/0433/4718/1718/files/13842007593.pdf
    • https://cdn.shopify.com/s/files/1/0432/6827/6384/files/bates_physical_exam.pdf
    • https://cdn.shopify.com/s/files/1/0430/8012/2532/files/nubizumareg.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/79972974495.pdf
    • https://cdn.shopify.com/s/files/1/0434/6318/0438/files/youtube_popout_player.pdf
    • https://cdn.shopify.com/s/files/1/0434/2412/0984/files/93076305771.pdf
    • https://cdn.shopify.com/s/files/1/0437/5658/5114/files/gebufubik.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/18067361526.pdf
    • https://cdn.shopify.com/s/files/1/0433/6523/6895/files/gumufofimusamilesu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/35022180152.pdf
    • https://cdn.shopify.com/s/files/1/0435/5014/6723/files/32393693428.pdf
    • https://cdn.shopify.com/s/files/1/0432/3265/7575/files/loxijesimul.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db71.bin
19ac67426f8a8ffc8d23adebd42ed7e667cf836b60f43d1b791147a4eea64b0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB71 4328 bytes
font_01_sfnt_off0000ea45.bin
15a7e6b1590e464f1a44b0e12d1a36a6ddcfa331fbddbe107e67ee457826abb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA45 14680 bytes

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