Malicious PDF — malware analysis report

Static analysis result for SHA-256 8350ef00b2f424eb…

MALICIOUS

PDF

38.6 KB Created: 2020-08-28 06:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d932c85bdbb4ba8af582f885ef327bff SHA-1: 950cd1b9cffe4ee76755e848afcc3fe15d55640a SHA-256: 8350ef00b2f424eb2906ae9ba9f53c30826f93223bf80384ce71848a68a9444c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external PDFs, many of which are hosted on Shopify and appear to be part of an SEO link farm designed to attract downloads. One prominent link, https://ttraff.com/pify?keyword=electronic+devices+and+circuit+theory+11th+edition+solution+manual+download, is identified as a malicious redirector, likely leading to a phishing or malware distribution site. The ML classifier strongly indicates maliciousness, and the overall structure suggests a phishing lure for a fake download.

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.com/pify?keyword=electronic+devices+and+circuit+theory+11th+edition+solution+manual+download In PDF document text
    • http://files.capitoloperarichmond.com/uploads/1/3/1/6/131606346/lotomowukumabiguf.pdfIn PDF document text
    • http://pijin.brijcommunity.org/uploads/1/3/2/3/132303354/mixawav_lunikufazujakoz_nobikok_segipegaxesol.pdfIn PDF document text
    • http://files.coreswinggolf.com/uploads/1/3/1/4/131454521/f8c2df0.pdfIn PDF document text
    • http://files.rev-pile.com/uploads/1/3/0/7/130739648/bikuka.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/1/0434/0016/7589/files/nejogosobegesivot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8022/0823/files/valve_guide_puller_tool.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0223/2983/files/lojedisuxabifodanelibefin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0451/1825/9365/files/stick_figure_games.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7654/0834/files/nunarerat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8434/1657/files/sogulegalokamafebidogox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9095/9766/files/os_x_el_capitan_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7708/4070/files/xotekixuwipogasavajibisom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7115/1007/files/bournside_sixth_form_centre.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5868/3294/files/37152348059.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9616/0921/files/ancre_hillsong.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6429/4557/files/53723234050.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6534/2117/files/rexutupas.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000554f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x554F 5444 bytes
SHA-256: 4938891e85cc4e1f7f2da0ff8b7490d38dd2d4c5f67dd5390126a841f62cefc7
font_01_sfnt_off000067bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67BC 10756 bytes
SHA-256: 518ad2a8ba963874770fda7c19fa55cd8b40befdb6f5a296f2b631cefa7ee8ae