Malicious PDF — malware analysis report

Static analysis result for SHA-256 a166db581e63be76…

MALICIOUS

PDF

41.3 KB Created: 2020-08-09 03:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 6b4eb4e0b749334bd61bc208978188a9 SHA-1: 8a883725f9c06e6e9569e5b466ae022ca456fe0f SHA-256: a166db581e63be76677d92dddd3767e9ac3de381cba2275e3edfd20534b4b61e
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating a link to malicious infrastructure. The document body and embedded links suggest a lure for free textbook downloads. The primary malicious IOC is the redirector URL, which is likely used to host or chain to further malicious content.

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=restoration+ecology+textbook+pdf In PDF document text
    • http://marow.successtar.org/uploads/1/3/0/7/130775403/fimaxijefa.pdfIn PDF document text
    • http://files.eratoalakiozidou.com/uploads/1/3/1/8/131871970/dimupesisiwomoz-danevapu.pdfIn PDF document text
    • http://files.justneighborsvt.org/uploads/1/3/2/6/132695280/wemubefoliwiwidari.pdfIn PDF document text
    • http://files.myislandmusic.com/uploads/1/3/0/7/130739892/d31720d.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/1/0430/3503/3757/files/33002742742.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9805/4558/files/la_dama_de_las_camelias_alejandro_dumas_hijo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6769/3474/files/didejibabofiniwojurajolax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4932/0610/files/87627316828.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9504/0924/files/overt_aggression_scale.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9970/9855/files/sokegokikagekidoba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8150/5695/files/precalculus_review.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8162/1919/files/boxupat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6262/3397/files/camera_scanner_to_tapscanner.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6406/5174/files/75338637617.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 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_off000061bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61BD 5704 bytes
SHA-256: 67b1f8e3ed4c028e3f69a1a77b7962c2705fd9d4e56a8478fc4c012d437b08bd
font_01_sfnt_off00007549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7549 10436 bytes
SHA-256: 5da3e0ecc534bf869fdc4739e484c8a21766242c2a893a1dc4534e9d0d425431

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