Malicious PDF — malware analysis report

Static analysis result for SHA-256 b53975989f4ec366…

MALICIOUS

PDF

46.9 KB Created: 2020-08-28 08:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 1a70991dbd9839265e17af65db5abe1c SHA-1: 32fbc3890c48e60fc0d91ed3b90f7eeed645be87 SHA-256: b53975989f4ec366aea8467450f5bacd58b7f00892200c51bb950976b6170221
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to a book summary and the URL that triggered the malicious redirector. The presence of a link farm within the PDF further supports the malicious intent of directing users to external, potentially harmful, 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.cc/pify?keyword=hard+thing+about+hard+things+book+summary In PDF document text
    • http://namedofi.vanforum.org/uploads/1/3/2/6/132681812/c1fc66b0a4.pdfIn PDF document text
    • http://files.autumnselover.com/uploads/1/3/1/4/131406412/gakixuwujotorep-pemobudir-pipaka-xobomifiwozogi.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/1/0461/9862/0323/files/kujelixuzidalufusemowowu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9544/8999/files/bebefava.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6676/9051/files/jolujijur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5197/3789/files/13125132587.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/8895/3751/files/kitten_feeding_guide_bottle.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5365/9798/files/91493039382.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/9651/8299/files/wordly_wise_3000_book_8_lesson_8.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7028/3173/files/90805824937.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9171/3447/files/41880912281.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2136/8472/files/astrix_et_la_surprise_de_csar_stre.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6775/8999/files/hashimoto_thyroiditis_guidelines.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9138/4736/files/74139076931.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1731/3178/files/sudulomesivoxepefono.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 4

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_off0000793c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x793C 5476 bytes
SHA-256: 1c6b4d2a7e391c8f6d687642497fc0476fb892a48697dc5b4e360d8ca6cb42f7
font_01_sfnt_off00008bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BAC 10204 bytes
SHA-256: d7722cc8c875c01585e392b5c92ac0ca460a0f0e22b3da4a8b54e7dac7711f0d

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