Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f12bf5d187b15a9…

MALICIOUS

PDF

58.2 KB Created: 2020-08-15 20:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 88a3a61b43a5af387e3a42fcc1022eb8 SHA-1: 527daf67095737622277fbdb79caa4d4f4ac7f6d SHA-256: 3f12bf5d187b15a9ceed4b77870255512ab5ea111797973a921838349e384d95
202 Risk Score

Malware Insights

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

The PDF file contains a lure related to 'Manual testing interview questions guru99' and includes a call-to-action phrase. It also contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure at 'ttraff.com'. The presence of a link farm and a malicious redirector suggests the document's primary purpose is to direct users to malicious content.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wb?keyword=manual%20testing%20interview%20questions%20guru99 In PDF document text
    • http://fumigete.adamsbiz.com/uploads/1/3/1/4/131453494/8ba2d03.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3039/6574/files/2363947938.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2072/2080/files/colonization_of_nigeria.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4382/3511/files/60031959392.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7644/3543/files/sangrado_por_varices_esofagicas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3182/2485/files/28556773920.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9900/4831/files/vojapakupudananew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5465/1799/files/65550914088.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2276/8535/files/77538043599.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1202/1657/files/76724308534.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000099be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99BE 5176 bytes
SHA-256: 2d442f51b2744ede00ebf7b2cd81104d74706682870e7f90553d2a5fa589a12a
font_01_sfnt_off0000ab6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB6F 10180 bytes
SHA-256: 16892aaa45df20ce6dd929251ed2c3c08428b78f183f663f9de2692b8632e473
font_02_sfnt_off0000ce07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE07 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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