Malicious PDF — malware analysis report

Static analysis result for SHA-256 b31d7c001e1cc95a…

MALICIOUS

PDF

38.8 KB Created: 2020-08-26 09:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 52512265a64ae9c829661a1f56c90852 SHA-1: 5a66dce6004eab80405c282d8ff52b23f02468f6 SHA-256: b31d7c001e1cc95aa0c188430f64b144eae73e3d4f7936714c1caa6ff6d33544
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link leads to a URL that appears to be part of a link farm designed to manipulate search engine results. The document body itself contains text related to a 'solution manual download', suggesting a lure to trick users into clicking the malicious link. No scripts were extracted from this sample.

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=genetics+from+genes+to+genomes+4th+edition+solution+manual+download In PDF document text
    • http://buloki.lgmcferren.com/uploads/1/3/1/3/131383629/c851d78ae4c857.pdfIn PDF document text
    • http://pedomefi.redlineinstallers.com/uploads/1/3/2/6/132680981/jojufunijovowewobu.pdfIn PDF document text
    • http://setebipob.kidsalldressedup.org/uploads/1/3/1/4/131438282/4eca73c.pdfIn PDF document text
    • http://files.projectfulfill.com/uploads/1/3/1/6/131636651/982358.pdfIn PDF document text
    • http://files.conversazioniconilventre.com/uploads/1/3/2/7/132740412/d7430d4c.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/1/0436/8292/2646/files/atomic_absorption_spectroscopy_file.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1581/2766/files/mathematics_book_class_8_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3767/7989/files/double_sided_adhesive_sheets_for_cricut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4351/8629/files/66634737954.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7053/5318/files/jessica_reddy_nude.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3908/8027/files/vumivinapigupitow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7962/2040/files/adobe_photoshop_lightroom_free_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4891/9450/files/49269093103.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_off00005894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5894 5648 bytes
SHA-256: 4c9bf3f62b271f41f963f8f1a7d84627acfaff6dd06e90dae029286d1280c30a
font_01_sfnt_off00006bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BB6 10044 bytes
SHA-256: 9d6316f700f961bc68027536d783982029591e5057f3269d5ac9f04879030ddf

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