Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd5c4dbc837946d1…

MALICIOUS

PDF

47.1 KB Created: 2020-08-12 12:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 27db9c774cfd7e2400be57d6b913155d SHA-1: da960480d815a60058e70ac4e4c776517734a3d1 SHA-256: fd5c4dbc837946d125b01f8b50d65fe6a45fd4b693048ade054f7abf52202412
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it's a malicious redirector. The primary malicious URL identified is https://ttraff.cc/pify?keyword=aarti+sangrah+pdf+download, which likely serves as a gateway to further malicious content. The document body, though heavily obfuscated, contains references to PDF downloads, reinforcing the lure. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=aarti+sangrah+pdf+download In PDF document text
    • http://files.storytimestamps.com/uploads/1/3/1/8/131857920/nomosokiwufusozodezu.pdfIn PDF document text
    • http://files.seetheworld.tours/uploads/1/3/2/8/132815961/bawifutopite.pdfIn PDF document text
    • http://files.cbckokomo.org/uploads/1/3/0/8/130813427/de40deedaa2.pdfIn PDF document text
    • http://files.onesource-ph.com/uploads/1/3/1/8/131857315/5f35e.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/1/0428/1804/4063/files/autonics_pr12_4dn.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8869/9802/files/18759198498.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6038/0327/files/92628532364.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6705/6028/files/leforaziredawiwibutufemej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5680/8607/files/kunogorisitigexasume.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/4349/9677/files/ielts_writing_task_2_topics_academic.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7857/4490/files/rovokepiziruridoposok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4704/9623/files/brain_manipulation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5214/6587/files/80049284081.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9717/7768/files/43516127662.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7532/9441/files/50521316610.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 8

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_off000070f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70F8 5384 bytes
SHA-256: 1dd8ea3844c406262bee253a0b2b1ab9156da8335b883a357fa6047ab72f8bd4
font_01_sfnt_off00008351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8351 14500 bytes
SHA-256: 5072595c1ee98a72abf7bb21ce890d30e1c1455a6783c43f559f079e98b2154d

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