Malicious PDF — malware analysis report

Static analysis result for SHA-256 897baf8655bca17c…

MALICIOUS

PDF

45.6 KB Created: 2020-08-19 03:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3ef0d6f210b7278cb1e88cb4e288f536 SHA-1: 10afa7fa2ef03bff5d46f5db565b2cbc2d22531f SHA-256: 897baf8655bca17cdc8b1bc00e2ca7d7b55366daa9ba6e8f873c09bc1d5c9bfb
194 Risk Score

Malware Insights

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

This PDF file contains multiple links designed to redirect users to external sites, masquerading as an employee reference letter. The primary malicious URL, 'https://ttraff.cc/pify?keyword=employee+reference+letter+word+format', is identified as a malicious redirector. The document also hosts a large number of external PDF links, likely for SEO manipulation or to distribute further malicious content. No scripts were extracted, but the embedded URLs and link farm strongly indicate a phishing or malware distribution attempt.

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=employee+reference+letter+word+format In PDF document text
    • http://files.studyenglish121.com/uploads/1/3/1/3/131384113/471988e.pdfIn PDF document text
    • http://files.h2020-tutorial.net/uploads/1/3/1/4/131483209/2383322.pdfIn PDF document text
    • http://files.mymountaindrive.com/uploads/1/3/0/7/130738632/2319138.pdfIn PDF document text
    • http://files.grottonsinchile.org/uploads/1/3/2/7/132740413/sojudade-sugonas-gasatis-gesazuvujiw.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/1/0428/7276/6631/files/76125272970.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0453/4692/files/lofimanedusufuxesan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6903/7980/files/27036514398.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8905/8209/files/38628105511.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0337/7824/files/37951510779.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2729/2582/files/6129010275.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7155/3189/files/10_class_date_sheet_2020_up_board_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4176/7072/files/graphing_exponential_functions_worksheet_algebra_1.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_off00007480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7480 5276 bytes
SHA-256: 199860dddc579319908ae78561544a97216be21d997517aac8b035024565c99d
font_01_sfnt_off0000866e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x866E 10460 bytes
SHA-256: 7b0d8255fa1a962bbb8504ff92f6a285295f0eecf4a2edff6db4f072486042d5

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