Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ba7b726a3db588…

MALICIOUS

PDF

37.9 KB Created: 2020-08-15 04:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b0a1513f98b674e725aed44ed885978b SHA-1: d691d5a582ef1a60ca32b6951399de24086cef1e SHA-256: 81ba7b726a3db5884bade7342d5f099e53eab87efae71ea9d8ee3ff36ea85474
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to a redirector service, indicating a link farm or phishing attempt. The primary redirector URL, 'https://ttraff.cc/wb?keyword=sheltering%20sky%20piano%20pdf', is flagged as malicious. This suggests the document is designed to lead users to malicious sites, likely for further exploitation or credential harvesting.

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/wb?keyword=sheltering%20sky%20piano%20pdf In PDF document text
    • http://files.moriahgracephotography.com/uploads/1/3/1/4/131453045/vetesowitip.pdfIn PDF document text
    • http://files.windofgreatspirithealing.com/uploads/1/3/0/7/130775649/guwovewefivug.pdfIn PDF document text
    • http://files.carlemile.com/uploads/1/3/0/7/130776684/18560d5e8f13.pdfIn PDF document text
    • http://files.boltontrailscommittee.org/uploads/1/3/2/8/132814343/97902a83881.pdfIn PDF document text
    • http://files.cleanturndr.com/uploads/1/3/1/4/131437932/1283637.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/1/0438/8388/8808/files/86674084568.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6497/5765/files/gurilutovolusopakorejebop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1030/8766/files/53337286054.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4302/7109/files/chemistry_textbook_pearson.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1958/2110/files/33786524576.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9583/5295/files/53986955720.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1613/4562/files/balsa_wood_plane_plans.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1520/8098/files/juzuwisibose.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6192/6293/files/employment_contract_singapore.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6163/9318/files/8862539062.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0357/5447/files/lutezejufir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7433/8454/files/annihilation_of_caste_ambedkar.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 7

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_off000055d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55D8 5572 bytes
SHA-256: 30d69bfe04ec828dc17c89391fd1a9a97ad117566fd412ef5dcb13b12e4b33b3
font_01_sfnt_off000068c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68C5 9992 bytes
SHA-256: 145835341ebbe829ff15c54d3c9c02aff74c031c3aa74377b5c47b32ace50946

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