Malicious PDF — malware analysis report

Static analysis result for SHA-256 990c6de57a358c06…

MALICIOUS

PDF

38.7 KB Created: 2020-08-14 11:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 13b0fb28f52293e50166e471f55793a9 SHA-1: 92d5df795aa383ee1085b9677ba876494439143d SHA-256: 990c6de57a358c064d9800a417872a2d7d20643fa635939200d03694a364ea2b
194 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains text related to 'Cara menghindari plagiat pdf' which is likely a lure to encourage clicks on the malicious link. The ML classifier also strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL.

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/wb?keyword=cara%20menghindari%20plagiat%20pdf In PDF document text
    • http://lamixa.nicolewilliamswrites.com/uploads/1/3/2/6/132682646/6559474.pdfIn PDF document text
    • http://welel.thsbusinessed.com/uploads/1/3/1/4/131453194/kewuluwam.pdfIn PDF document text
    • http://zugiworar.en-technologiesinc.com/uploads/1/3/1/3/131398564/bupifusumujosasuze.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/1/0434/8297/2326/files/gowexoxajume.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8087/4139/files/91094773833.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1423/4017/files/masewikup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1137/5267/files/kisalunafenarovux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/43891187222.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0939/2285/files/64604748701.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4374/1083/files/cement_brick_making_process.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/peregomosurexezobosezob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0298/5626/files/7896369724.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/gunavakud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9232/8104/files/90371494551.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7147/1767/files/lowuvepedidoge.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 2

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_off00005af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AF8 5184 bytes
SHA-256: 8e349ba948598936057c78e4299491c81c64bfb624a3e61592a3bd485f737cf5
font_01_sfnt_off00006c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C6A 9860 bytes
SHA-256: 1ce27633b06f99ba27120d9c4b76848c4b6685a42800eeb5a1f856e917121f73

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