Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c771c239b05580…

MALICIOUS

PDF

33.6 KB Created: 2020-08-11 08:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 52131d194ccc49c774c6e7f4bd97b0ba SHA-1: 766cd37256dc5c4aa46bbe0c9cb87c26571423be SHA-256: 31c771c239b0558079baa658fc862c21031182019b0f065c5e9961071a852fb7
194 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that leads to the redirector. This suggests the document's purpose is to trick users into visiting malicious infrastructure by presenting itself as a harmless PDF.

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=papercraft+kereta+api+indonesia+pdf In PDF document text
    • http://tidibaris.michelleblanchette.org/uploads/1/3/1/6/131636725/gadalisukux-xokizarumujoju-mumosukobovo-dipofasa.pdfIn PDF document text
    • http://files.andrewmoschetti.com/uploads/1/3/1/4/131482975/zefuwomiwuwemunidu.pdfIn PDF document text
    • http://files.gslcs.com/uploads/1/3/0/7/130776267/kavorawurusu-tisolazebuf-wexunile-fekojijapituwol.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/1/0434/2022/1607/files/waxisatem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2528/5798/files/21871610016.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0761/4882/files/kulesemaworedapitasafol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3246/0960/files/59419517375.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3082/3583/files/67894539535.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sedafasejizal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9888/9635/files/rotofusowurim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0379/7913/files/40901989337.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7896/6686/files/lm741_op_amp.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1423/4017/files/52613098747.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/71655948244.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8948/4189/files/zojikijaje.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 3

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_off00004622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4622 5184 bytes
SHA-256: 80044df395a1cb6b0f90a102effefa9ff3c72132a775a389fb444ef7b8b25faf
font_01_sfnt_off000057cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57CB 9840 bytes
SHA-256: fd772d480fd4cab85d6c80ef80b5f06499a22466f12513612f3ee9e96ea7c9e3

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