Malicious PDF — malware analysis report

Static analysis result for SHA-256 751888655d938930…

MALICIOUS

PDF

41.8 KB Created: 2020-08-21 06:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9a8c3d9816d8594c35359e15924108b SHA-1: d8233b97ac23176b9ab32426c1516c852b671f72 SHA-256: 751888655d938930441c08d2964613571fca040cbae4d4af6e76960a9b1a3d5a
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, many of which point to what appears to be a link farm designed for SEO manipulation. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.ru/pify. The document body, though heavily obfuscated, contains text related to 'automobile engineering ebook pdf free', suggesting a lure to entice clicks. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.ru/pify?keyword=automobile+engineering+ebook+pdf+free
    • http://files.makingmathmagic.net/uploads/1/3/0/8/130874266/zaziwuvusede_naseguvixaf.pdf
    • http://files.johnashcroftandcompany.com/uploads/1/3/0/9/130969368/zamilusi.pdf
    • http://jarozujev.mrcarnahan.com/uploads/1/3/1/4/131407406/3656479.pdf
    • http://watuden.flowhoodriver.com/uploads/1/3/0/7/130775904/palenedokin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/harvest_moon_animal_parade_iso.pdf
    • https://cdn.shopify.com/s/files/1/0437/7057/7045/files/drastic_ds_emulator_aptoide.pdf
    • https://cdn.shopify.com/s/files/1/0431/8766/7104/files/metaxataterutikatav.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7957/files/rutawimerorabiteluwed.pdf
    • https://cdn.shopify.com/s/files/1/0440/2269/4046/files/54125911675.pdf
    • https://cdn.shopify.com/s/files/1/0435/5319/4133/files/boris_cyrulnik_morirse_de_verguenza.pdf
    • https://cdn.shopify.com/s/files/1/0434/1714/1415/files/brothers_in_arms_2_apk_data.pdf
    • https://cdn.shopify.com/s/files/1/0432/4301/2256/files/5_styles_of_leadership.pdf
    • https://cdn.shopify.com/s/files/1/0435/4818/0634/files/warping_machine.pdf
    • https://cdn.shopify.com/s/files/1/0429/6497/5765/files/bozedasuzolixopajaloraded.pdf
    • https://cdn.shopify.com/s/files/1/0429/9295/9642/files/91661304409.pdf
    • https://cdn.shopify.com/s/files/1/0428/0942/6079/files/nekumiwozavoxi.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_off00006623.bin
66d953211c19a6bbfb4215027455c5b8469c309d4cedb7af2271bb1ceeb245fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6623 5164 bytes
font_01_sfnt_off000077a4.bin
87fee3c1d42f0e2e843ee9dd727f4586092b920e6ff51c51f9b354beeb03a8b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77A4 9996 bytes

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