Malicious PDF — malware analysis report

Static analysis result for SHA-256 7158df645cc09d66…

MALICIOUS

PDF

44.2 KB Created: 2020-08-16 12:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53860366537ec74ae0397f3243975612 SHA-1: fdfaa24988dc3c412f83c24ab88f090de9540db9 SHA-256: 7158df645cc09d66037d73685cc1844d3f96e96a00822a4f01ad8d2119ff55f6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'ttraff.ru', indicating a potential phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

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.ru/pify?keyword=accidental+breakup+natok
    • http://files.chernock.net/uploads/1/3/0/7/130740591/4333586.pdf
    • http://files.westerncanineacademy.ca/uploads/1/3/0/7/130775475/nitut-vadakurovopi.pdf
    • http://files.downtherabbitholewines.com/uploads/1/3/2/6/132681362/gevufaguxuliwine.pdf
    • http://files.vesselartsco.com/uploads/1/3/1/3/131381204/5698121.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/one_way_anova_manual_calculation_example.pdf
    • https://cdn.shopify.com/s/files/1/0441/2211/2152/files/fundamentals_of_computer_operating_system.pdf
    • https://cdn.shopify.com/s/files/1/0430/4093/1991/files/94864145228.pdf
    • https://cdn.shopify.com/s/files/1/0441/1041/3976/files/muzimofugizu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9791/5545/files/42676840986.pdf
    • https://cdn.shopify.com/s/files/1/0432/4642/0136/files/wosezuxufuwegox.pdf
    • https://cdn.shopify.com/s/files/1/0431/9641/6160/files/davixutosunarezigagoresub.pdf
    • https://cdn.shopify.com/s/files/1/0436/5074/4478/files/ccna_voice_lab.pdf
    • https://cdn.shopify.com/s/files/1/0435/8776/4387/files/islamic_book_bikhre_moti_pdf.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://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054d4.bin
efa5fb21877ca44b563479f72cb7c74b8a39f0ac6a91ba2155aa7e28e85c7104		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54D4 5084 bytes
font_01_sfnt_off00006612.bin
8794a85925fb7b1bee397e9e5354972967ef2339cf7788baca909f7a350da4a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6612 8352 bytes
font_02_sfnt_off00008104.bin
a98798b842ed84c65d7c3f99343143a9811f3b201e521d36207894fec006dd76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8104 10168 bytes

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