Malicious PDF — malware analysis report

Static analysis result for SHA-256 d366f389a472bebd…

MALICIOUS

PDF

35.4 KB Created: 2020-08-29 09:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f0426a4b0734d6336745084a5a52cab6 SHA-1: 670bc79e6c8d1977e3d92dec4cf4b47730983af2 SHA-256: d366f389a472bebd38c0c9d48527c0c201f116e6fae37a8f8f59983a7ae09aff
194 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic identifying a link to known malicious redirector infrastructure. The document body contains the text 'Sedra and smith 7th edition' alongside the malicious URL, suggesting a lure to disguise the malicious intent. The presence of numerous external PDF links, many pointing to static.usrfiles.com, further supports the 'link farm' heuristic, indicating an attempt to manipulate search engine results or distribute content through a network of linked documents. 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/wix?keyword=sedra+and+smith+7th+edition In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static.usrfiles.com/ugd/b8c837_8eb7c0c4a5ac4d84ac2deba233118111.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_c96740ab6ee34f53860dfc5eaa2c8316.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_cebfd4218f284c44a4ef5ce093e729b0.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9429/5203/files/85181313194.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7465/0261/files/zimemisivoma.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7378/1411/files/bunugunukizafot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0000/3749/files/40039540955.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_7999ec000b414b9ab60f8d2f27abc963.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_cf0d6220e13d49c58033b74ce4b832b3.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000415c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x415C 5004 bytes
SHA-256: a566907b2cdd4522c4b2ddeb74039217c78d94d1b823a060599e04516d76f14d
font_01_sfnt_off00005223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5223 9656 bytes
SHA-256: 7d5eb4cfbf3318a34270eb8b18b877a5f9a9bed2a508a833c9d7789077c6b2e9
font_02_sfnt_off0000732c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x732C 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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