Malicious PDF — malware analysis report

Static analysis result for SHA-256 40993c280f5e760f…

MALICIOUS

PDF

58.1 KB Created: 2020-07-31 07:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 8053c0ed8c7b0084a00f972d1b3a1d6a SHA-1: fd70d7c750952d015da056cbbe8b2641509c4321 SHA-256: 40993c280f5e760fe6bc5c10b7016ab5fdcbe86c407752651839a72063b25fa8
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, pointing to 'https://ttraff.cc/pify?keyword=biological+oxygen+demand+meaning+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on Shopify. The document body, though heavily obfuscated, contains text related to 'Biological oxygen demand meaning pdf' and 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The primary goal appears to be redirecting users to 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=biological+oxygen+demand+meaning+pdf In PDF document text
    • http://files.gruffcorn13.com/uploads/1/3/0/7/130775536/53dc180f9b45.pdfIn PDF document text
    • http://files.mywright2bdazzled.com/uploads/1/3/1/3/131383586/ec8a2.pdfIn PDF document text
    • http://files.davidemariano.com/uploads/1/3/2/6/132681694/12d8564.pdfIn PDF document text
    • http://files.westlakejuniorwomensclub.com/uploads/1/3/1/6/131606284/9103500.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/1/0429/7634/6266/files/71546357056.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4115/2421/files/bonuzafobilugosi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/9284441163.pdf?v=1594212706In PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9972/4702/files/68275977525.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5516/9186/files/xasupaxinuzowafag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0288/8351/files/romaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2994/5758/files/dapelolov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7927/7467/files/ginegenuforinivapegif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4047/2214/files/xosetamiwirigeji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3886/6593/files/vebamubugin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3532/8663/files/12602885498.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16946396068.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rejumaxerufu.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
🗂 Part of campaign: davidemariano.com 3 samples

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_off0000a603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA603 5128 bytes
SHA-256: 0f341803198e8c214cd90b0a08eda219461797bf21f0037b7a423a6167209d19
font_01_sfnt_off0000b75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB75E 10640 bytes
SHA-256: ba949d7fd37427c442a354287909c357c96e82a226ba2b5a1855e28aa80e7cf1

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