Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e6688777d9ee75…

MALICIOUS

PDF

41.2 KB Created: 2020-08-09 10:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: e4567b1be5b0745ca982a9a1e2e92632 SHA-1: 7c053bd72ee60d64e774a1f7f4a125c5819a3515 SHA-256: 81e6688777d9ee75bb0a072e5f59ba3db35b8105390cdba0bfed56f81d06c5a0
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to a redirector service (ttraff.cc) which is flagged as malicious. The document body, though heavily obfuscated, contains text suggesting it is a lure for 'basics of electronics and instrumentation engineering pdf', likely a phishing or scam attempt to drive traffic to malicious sites. The presence of many external links, including a link farm, indicates a tactic to distribute malicious content or engage in SEO manipulation for phishing.

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.cc/pify?keyword=basics+of+electronics+and+instrumentation+engineering+pdf In PDF document text
    • http://files.edsworldwide.org/uploads/1/3/2/7/132740320/sotilemiz-gukixedesimujar-bevulas-lativeponeji.pdfIn PDF document text
    • http://files.nessasnotes.com/uploads/1/3/1/3/131379409/dunafakasor.pdfIn PDF document text
    • http://files.habitathawaiiisland.org/uploads/1/3/0/7/130775892/giganikogim_siwozujolupu.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/1/0431/1698/6534/files/jacksmith_cool_math.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2327/7973/files/pelegilime.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4845/9673/files/19812967367.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5757/8138/files/93336316244.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9476/1877/files/71066727482.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6686/0455/files/zukara.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2328/5920/files/76194894004.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4948/3426/files/77795408943.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6725/1615/files/a_noite_do_meu_bem_partitura.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mirogorozizodixomalejog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4088/2340/files/onn_universal_remote_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7817/3343/files/wotedanakologazoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0577/1927/files/41864713274.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_off00006122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6122 5524 bytes
SHA-256: 8fb0d418a1e16eb1531dbc1dc839a6145b5c7e7824994122e2aa18a4a482d19c
font_01_sfnt_off000073da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73DA 9852 bytes
SHA-256: c7efccff69b4cfdf7a615be2f0ea87fca04d543dde550573c05857facef9e58b

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