Malicious PDF — malware analysis report

Static analysis result for SHA-256 661376f9c1784f98…

MALICIOUS

PDF

41.8 KB Created: 2020-09-11 18:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: dfab612fec4702e076a5d0f21b9d71f5 SHA-1: 1b0a0bf18359ec0cb229faceee9a74bf3d530a11 SHA-256: 661376f9c1784f98a29e7ad4535fe1a9cbd50f1e0eb4089cdd7b11e89df7aff8
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to a redirector service that ultimately leads to a malicious URL. The document body, though heavily obfuscated, contains the primary malicious URL, suggesting a phishing or scam attempt. The ML classifier strongly indicates maliciousness, and the presence of a redirector link confirms the intent to lead the user to a harmful site.

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.me/wix?keyword=iron+man+face+mask+template In PDF document text
    • http://files.universalsportsstrength.com/uploads/1/3/0/7/130740483/7ef72ff.pdfIn PDF document text
    • http://files.orderyourbluebook.com/uploads/1/3/1/3/131379894/lapinogujukofuti.pdfIn PDF document text
    • http://files.campbel.ca/uploads/1/3/2/7/132741110/zoxujeta.pdfIn PDF document text
    • http://files.elizabethkpetersonlab.com/uploads/1/3/1/3/131384789/sibufajoj-xuvini.pdfIn PDF document text
    • http://funara.oxfordbakingcompany.com/uploads/1/3/0/7/130775889/dizugomukuxuru_tulekajowabu_bapefipefu.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/1/0479/6920/6435/files/45998808155.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/bujimigovari.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5544/7201/files/mapizikanuvuruwizekikodu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1564/3031/files/79588048397.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_7e178cdb969847e5933a8d0d38cee5e7.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a374b9_5ff58f4d386f4e038c8c5866fa4e19ba.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ba3095_e5b892e2981a4d099de3d3a6953d1fe6.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3867/7924/files/6885998468.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0409/9740/files/lexical_and_functional_categories.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4018/7303/files/49416547093.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1895/9523/files/3893793989.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7870/4536/files/67333628814.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_off000066d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66D9 5160 bytes
SHA-256: 9b8331be2dace9f144545e9ec5bd4f67e78d6169e00b87980c7f5231afbf60d4
font_01_sfnt_off00007854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7854 9964 bytes
SHA-256: 4aecb0e0b97a64b0eab5e6f92d33a65e84935ceb8738babac3b0fd5d27411c12

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