Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d88975619fe8240…

MALICIOUS

PDF

42.7 KB Created: 2020-08-07 21:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4914d847e24a9277e2b4541ed1cba5bf SHA-1: 12e62187430b68b6a1dbffbb44b690c9c5fb928c SHA-256: 6d88975619fe8240d256f85cf54553c78b47ef2aec80286495cbf78255942aa9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, including one pointing to a known malicious redirector at 'ttraff.com'. The document body, though partially corrupted, suggests a lure for a 'free PDF download'. The presence of many external links, some to benign Shopify URLs and others to unknown hosts, indicates a link farm or redirection scheme designed to lead users to malicious content. The ML classifier strongly supports the malicious verdict.

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=curso+completo+de+economia+em+pdf
    • http://files.mtdistrictcc.com/uploads/1/3/0/8/130813466/6422331.pdf
    • http://files.rearrangewithstyle.com/uploads/1/3/1/4/131407492/cdd08d2facf857.pdf
    • http://files.janedelafordtaylor.com/uploads/1/3/1/0/131070149/vupif.pdf
    • http://files.hubbardlakegolfshop.com/uploads/1/3/0/7/130776499/sugejerozarawujufefe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5450/5885/files/62829712415.pdf
    • https://cdn.shopify.com/s/files/1/0436/3055/9390/files/gepujakumabupezutet.pdf
    • https://cdn.shopify.com/s/files/1/0435/5152/2977/files/81646941445.pdf
    • https://cdn.shopify.com/s/files/1/0430/5171/2666/files/9438859350.pdf
    • https://cdn.shopify.com/s/files/1/0433/6150/1336/files/convert_odt_file_to.pdf
    • https://cdn.shopify.com/s/files/1/0428/3426/4220/files/palmistry_money_line.pdf
    • https://cdn.shopify.com/s/files/1/0432/5477/5970/files/28112361990.pdf
    • https://cdn.shopify.com/s/files/1/0434/2277/7496/files/knee_strengthening_exercises_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0434/5197/3789/files/de_cero_a_uno_peter_thiel_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0431/7121/7565/files/minecraft_villager_workstations.pdf
    • https://cdn.shopify.com/s/files/1/0435/4647/6708/files/cancel_direct_tv.pdf
    • https://cdn.shopify.com/s/files/1/0434/8212/0357/files/niduwiru.pdf
    • https://cdn.shopify.com/s/files/1/0428/8145/0147/files/xenarirowipulo.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_off000061d2.bin
873e23d4cd449f7d6221414551e3d0ec1a100612bde15709194b7a4dcad51dd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61D2 5208 bytes
font_01_sfnt_off0000736c.bin
90bc38577f729385fe0a459d5f496fa1c0e5f235f3bd6312ebfd690722bd0ef6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x736C 13544 bytes

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