Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8b4f251773cca3…

MALICIOUS

PDF

35.0 KB Created: 2020-08-17 10:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 6cd5fab9b127f16ba8c7855f6b619f2a SHA-1: 3af4a6caddafce16d17aedafe79454a7c6139850 SHA-256: 3a8b4f251773cca31ee732fd54a881af98690c4a2b0e45b13066b2f3e02e874e
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure via the URL https://ttraff.com/pify?keyword=penguin+readers+level+6+pdf. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The presence of numerous other PDF links, many hosted on cdn.shopify.com, indicates a link farm strategy to improve search engine visibility for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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=penguin+readers+level+6+pdf In PDF document text
    • http://nofufi.astiquesalon.com/uploads/1/3/1/1/131164250/8772431.pdfIn PDF document text
    • http://files.dicendipublishing.com/uploads/1/3/1/4/131452872/2719600.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/1/0429/6366/5062/files/namita_agrawal_all_odia_bhajan_songs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0443/1986/7036/files/daffynition_decoder_angles_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/6466/7810/files/business_proposal_format_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1141/5959/files/arithmetic_progression_examples.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/8258/6014/files/bernard_werber_les_fourmis_gratuit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8462/7616/files/36837766162.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5670/9273/files/74893021227.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3765/5191/files/administrao_pblica_idalberto_chiavenato.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49186839350.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5954/2176/files/bujumudogidawoxufi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/89866996993.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0046/2503/files/90223907117.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 4

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_off00004a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A47 5424 bytes
SHA-256: 52e76037f2179f33fd11941f748eeed17a8e8f4df63488dc5f2bcb3da56c4ebb
font_01_sfnt_off00005ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CCB 10440 bytes
SHA-256: a555320e77be39adfe9517903f36857a0e1a199cd018fe9bb4c7d0caee956aa5

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