Malicious PDF — malware analysis report

Static analysis result for SHA-256 0721e786659edbeb…

MALICIOUS

PDF

54.0 KB Created: 2020-08-27 13:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2640dffbb24663bc4258b65486f35a13 SHA-1: 6732ffd052ebae32bebc16d74d31c7e4538c5436 SHA-256: 0721e786659edbeb3e747c25b4ba89e029f9af9b60b7ea238961e3675b02f5cb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a free download for an Opel Corsa workshop manual. The document also includes a large number of links to other PDFs hosted on various domains, suggesting a link farm or SEO poisoning tactic to attract victims. The ML classifier strongly indicated maliciousness, supporting the conclusion that this document is designed to redirect users to harmful 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/pify?keyword=opel+corsa+workshop+manual+free+down
    • http://files.ntqgchicago.net/uploads/1/3/0/9/130969673/kemebanogiridan-fawotovizu-belimu-sebimalix.pdf
    • http://pukoxal.thesecretplaceactorsstudio.com/uploads/1/3/2/6/132681946/139237f7bb6a.pdf
    • http://files.studiotreen.com/uploads/1/3/1/3/131379894/xuxoje_wusexif.pdf
    • http://files.meowstories.us/uploads/1/3/1/3/131380292/jorovutogemifu.pdf
    • http://files.gchmg.org/uploads/1/3/0/8/130814169/toxenaxudezisazo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3796/5986/files/roblox_fortnite_dance.pdf
    • https://cdn.shopify.com/s/files/1/0444/6869/9303/files/economia_ambiental_y_economia_ecologica.pdf
    • https://cdn.shopify.com/s/files/1/0430/8808/5143/files/jisegifobawavewiloj.pdf
    • https://cdn.shopify.com/s/files/1/0448/6466/7810/files/starbucks_employee_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/4116/0344/files/bogaru.pdf
    • https://cdn.shopify.com/s/files/1/0431/4988/5606/files/oathbringer_chapter_summaries.pdf
    • https://cdn.shopify.com/s/files/1/0431/8298/1278/files/simple_bakery_business_plan.pdf
    • https://cdn.shopify.com/s/files/1/0434/7753/2822/files/annual_trustee_payment_report_information_2018.pdf
    • https://cdn.shopify.com/s/files/1/0431/2789/8268/files/tenusoresomo.pdf
    • https://cdn.shopify.com/s/files/1/0427/8580/0358/files/lobamuna.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000751a.bin
e1d9c0a000dad37ff777831e7ec3f9e9a52ac05800ea9b7d07a6618a3e433a21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x751A 5580 bytes
font_01_sfnt_off000087f2.bin
05c4eda86512752508564171905c59c80c5a86b721691fa094de96a29060ed50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87F2 14028 bytes
font_02_sfnt_off0000b3bb.bin
6820151f9a4816bccc9e85e605aef44ce22c8924dfcccd161584754f275bf028		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BB 16132 bytes

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