Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c6c222d2424049d…

MALICIOUS

PDF

41.6 KB Created: 2020-08-06 07:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 379e2fa6902d3b6febcf7452a3423345 SHA-1: cc578fa838231279a457f12c025fe7434b37460d SHA-256: 7c6c222d2424049da8d414e9f77fd217c6b9ae713a1a51e6d4f34937a1ec1cdf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, which is indicative of a link farm for SEO manipulation or traffic redirection. One of the primary links, 'https://ttraff.ru/pify?keyword=medio+ambiente+laboral+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated and contains metadata related to wkhtmltopdf, suggesting it was programmatically generated.

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=medio+ambiente+laboral+pdf
    • http://files.casjanssen.org/uploads/1/3/1/3/131383727/tuvopelevimuge.pdf
    • http://files.vanpickuppr.com/uploads/1/3/0/8/130813694/bupoxozewe_nafob_wujuxa.pdf
    • http://files.brownfarmsstrawberries.com/uploads/1/3/0/7/130775174/3547192.pdf
    • http://files.microbladingbyz.com/uploads/1/3/0/8/130873893/wonaberuj.pdf
    • http://files.tachelesstmk.org/uploads/1/3/1/3/131380094/7652265.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3602/4742/files/31347849371.pdf
    • https://cdn.shopify.com/s/files/1/0431/9569/5266/files/14685589677.pdf
    • https://cdn.shopify.com/s/files/1/0434/5203/9324/files/laview_hikvision_firmware.pdf
    • https://cdn.shopify.com/s/files/1/0432/8184/2341/files/moketozobikubag.pdf
    • https://cdn.shopify.com/s/files/1/0434/7520/6294/files/kegapagisukij.pdf
    • https://cdn.shopify.com/s/files/1/0433/2270/4030/files/43307124008.pdf
    • https://cdn.shopify.com/s/files/1/0451/1324/5848/files/manual_dexterity_activities.pdf
    • https://cdn.shopify.com/s/files/1/0430/8316/9943/files/jusikol.pdf
    • https://cdn.shopify.com/s/files/1/0436/5726/5305/files/62064695670.pdf
    • https://cdn.shopify.com/s/files/1/0427/6820/3942/files/xilitasegidijufotido.pdf
    • https://cdn.shopify.com/s/files/1/0437/7106/8577/files/sikowufowamumumejewujiri.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_off000062ad.bin
5a4dc85186998ac6996b4e677c896c09fb4544a4c7a792d2893a6a5e89ccdb55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62AD 5156 bytes
font_01_sfnt_off00007420.bin
6742e12891ffb3c255d657531a41bff80d973bebf89e1616bd2d1006455dadf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7420 11048 bytes

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