Malicious PDF — malware analysis report

Static analysis result for SHA-256 a75d4726ae00fb38…

MALICIOUS

PDF

44.9 KB Created: 2020-08-20 04:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4c15d0881ad50b6d129e4cd94765406b SHA-1: dfb5a114abc383eb1d9e54613f9708af30613958 SHA-256: a75d4726ae00fb38a6acafcb1547b2dce93c04cbbdc6a43efd684dbddb0b0c72
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector. The document body, though partially corrupted, contains text referencing 'Dotabuff huskar guide' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of a PDF link farm further indicates an attempt to distribute malicious content or engage in SEO poisoning.

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=dotabuff+huskar+guide In PDF document text
    • http://nevalotef.wellness.org.sg/uploads/1/3/1/3/131384260/4591653.pdfIn PDF document text
    • http://dojaguk.scribblesandwhispers.com/uploads/1/3/1/3/131398020/moxir.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/1/0432/9209/8726/files/41423850655.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/8212/5205/files/bejefavabik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0760/5918/files/6102223418.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1137/5267/files/panivoduri.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1568/1701/files/valefopi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8883/0873/files/59690426386.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2626/7806/files/54645199437.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/9628/8923/files/88646357004.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/algorithms_robert_sedgewick.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zilifevuzumojewod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8759/2608/files/pidokuvofadiburere.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
🗂 Part of campaign: org.sg 5 samples

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_off0000674b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x674B 5340 bytes
SHA-256: 96e752136d23d1c9a60b20560d3f5d03673763ce21acb8d51d9067ffe9a6ba54
font_01_sfnt_off0000796e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x796E 15412 bytes
SHA-256: 52619b209eba1bf324e8fab52aefcdbd901895f836e6eaf84e6f1f822d217985

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