Malicious PDF — malware analysis report

Static analysis result for SHA-256 164a7e3d147cba53…

MALICIOUS

PDF

42.7 KB Created: 2020-08-25 00:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 8834cf635421c3251e2445d0cc60894f SHA-1: 6a954e8b785590162d93c1bb2ce40007787fef8f SHA-256: 164a7e3d147cba535c546661ee184504cd1021faf9216e6145a8ffa059ad7f85
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a redirector infrastructure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=android+adblock+without+root, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other PDF files, suggesting a link farm or SEO poisoning tactic to lure users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=android+adblock+without+root In PDF document text
    • http://files.dough-factory.com/uploads/1/3/1/4/131455621/lolexituzofo.pdfIn PDF document text
    • http://files.slatteryschoolphotography.co.uk/uploads/1/3/1/4/131406390/4617972.pdfIn PDF document text
    • http://manedat.enricohairandspa.com/uploads/1/3/2/7/132740720/bedorerebolepe-busasal-debigakadeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8466/7287/files/vidafusixolaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6447/5299/files/halloween_hd_wallpapers_1080p.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9728/5027/files/81151095381.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/34328807314.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3957/2643/files/59046974215.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1760/7067/files/bunotu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3714/7804/files/6284837411.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4978/8327/files/98624750373.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2174/6847/files/jusewisopulagubobavex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6067/4198/files/rogakaxejotef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5767/5421/files/zamaxaruvo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8620/8406/files/uppsc_calendar_2020_download.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A16 5132 bytes
SHA-256: 4f03e2a884cd7d13e6adc55e160456370f937e8468923995a949f48b02cb952e
font_01_sfnt_off00007b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B8E 10008 bytes
SHA-256: bd1982b70c14dd7b4e89d5154bd814ebbd505eff4d487b738f587797c149f368

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