Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac5db5b142cc722b…

MALICIOUS

PDF

38.8 KB Created: 2020-08-05 07:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 344b8c5e8157a09faf4be0285da78035 SHA-1: acaec3b3c70ed0f8b17073bb8c304bcd881deeb7 SHA-256: ac5db5b142cc722b4be0ba4ff53cacb783c13a3139bc35a9be51c4128f1b3c97
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 for PDF_MALICIOUS_REDIRECTOR_LINK pointing to ttraff.ru. The document body, though heavily obfuscated, contains the string 'Diagnosa diare pada anak pdf', suggesting a lure to disguise malicious links as legitimate medical information. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, likely for SEO poisoning or to distribute further malware. No scripts were extracted from this sample.

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.ru/pify?keyword=diagnosa+diare+pada+anak+pdf In PDF document text
    • http://files.timferriss.com/uploads/1/3/0/7/130775701/wawabofa-xabaf-mowojibebid.pdfIn PDF document text
    • http://files.vanvolleyleague.ca/uploads/1/3/1/3/131398547/kikasawuxumitebatek.pdfIn PDF document text
    • http://files.kenmoreta.org/uploads/1/3/0/7/130776509/xutunu.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/1/0434/1635/4978/files/aseptic_techniques_microbiology.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2900/3416/files/tepokazojogow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6887/5157/files/tidegukolirumiwekadew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7744/3483/files/48436261616.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4166/0826/files/jejigofam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1448/0287/files/ribemariwome.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3393/4496/files/11160446107.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5206/3137/files/66201235759.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1376/6296/files/denelifanusilen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7879/2869/files/nepek.pdfIn PDF document text
    • https://doi.org/10.37676/jmi.v8i2.85In 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_off00005b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B88 5240 bytes
SHA-256: f419dd49e30875e993a63523dfaadbc02459b21e600830a7e8daf17a87c46e40
font_01_sfnt_off00006d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D73 9824 bytes
SHA-256: fa2cc2447280bc959a8230edea1da13e8eaa85e5fc87755a75eb8f719a9db9c7

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