Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5831c4f90929f59…

MALICIOUS

PDF

118.9 KB Created: 2020-08-25 06:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b7d599a9b40a108813b7fc82555ec1d1 SHA-1: 0f4ea7ae19e1c1934c2197fbd7c80c08f17ed0ce SHA-256: b5831c4f90929f590f2b4021be87e94483313599ae6d4fe9e204263d71933e87
194 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating a malicious redirector link and a link farm, alongside an advance-fee scam lure. The document body, though heavily obfuscated, contains a URL that is also flagged as a malicious redirector. This suggests the primary goal is to redirect the user to a malicious site, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=lagu+bts+fake+love+versi+piano In PDF document text
    • http://files.mosaicsyourway.com/uploads/1/3/1/8/131871535/297367.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/1/0434/3260/7900/files/jipofedupasasafogofejava.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/6512/0670/files/cbse_biology_textbook_for_class_12.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1910/7480/files/pojeke.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2292/6492/files/sawelugufesetevol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/0088/1315/files/50_sheets_of_paper_crossword_clue.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3820/2273/files/lateberudi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7395/4204/files/73072988773.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/5418/9983/files/86283577021.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4351/2732/files/meditation_now_a_beginner_s_guide.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 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010fdf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10FDF 39556 bytes
SHA-256: fc161210152e57ea2476e1393d266380be63207acf066dcf22356d2db793ff4e
font_01_sfnt_off000185e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185E5 5276 bytes
SHA-256: 25ab49f04c00defef9f7f03de93a3c7578a18bdb63563a8fa97d62510c2b9be7
font_02_sfnt_off000197ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197EF 17712 bytes
SHA-256: 8222c1a8d5a80ea32c70eb9a473366fffd7ce0c6324e14a76b2fba74782370d2

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