Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a76f6065332a99…

MALICIOUS

PDF

47.8 KB Created: 2020-08-18 23:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a52f2263891b73dd56e0ddcdd5f153fd SHA-1: fd0f8bc4a07e4a15b7d450f5ef080cb9565d4aa8 SHA-256: 90a76f6065332a99d7f6ba73bb2cccf130e92d2690c68ac1edd78bbf0956d46f
194 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one specifically identified as a malicious redirector. The heuristic firings indicate a PDF link farm, suggesting an attempt to manipulate search results or distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the sheer volume of links and the identified malicious redirector point to a content-driven attack.

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.ru/pify?keyword=ost+partners+for+justice In PDF document text
    • http://files.modtone.net/uploads/1/3/1/4/131410545/paxarugutemogafoto.pdfIn PDF document text
    • http://files.k1academy.ca/uploads/1/3/2/6/132681812/takekuwevakuwonewik.pdfIn PDF document text
    • http://vemake.moundridgelumber.com/uploads/1/3/0/7/130776418/c20e5f.pdfIn PDF document text
    • http://gefon.yankeetravelers.com/uploads/1/3/2/6/132695278/rajaloza.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/1/0432/4805/8536/files/49748800868.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1018/6654/files/96174386745.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6374/6453/files/2017_audi_a5_convertible.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3705/6414/files/20457856401.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49893706483.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/6190/7351/files/seafood_recipes_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8851/1130/files/adjective_noun_collocations_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4855/9004/files/wings_of_fire_book_in_english.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5127/0815/files/39665158804.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000573e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x573E 4840 bytes
SHA-256: a566ce3105340e691c939f786e86504772a482c664788d0966c33bcb3ac8c6de
font_01_sfnt_off0000682b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x682B 5080 bytes
SHA-256: 2f052ce7f2d098a6ebfa44d0e6a8cd6b798ffdc4b97a724585b0f2bc88c99536
font_02_sfnt_off00007988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7988 10192 bytes
SHA-256: 6d2f7d376be931d02c766255b4464fc36f9d51d06f9dde3967634bfd4fa96b25
font_03_sfnt_off00009cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9CB4 16232 bytes
SHA-256: ac5d9198e9e5788e2012a92f79ae3d93b0172fa872ff4df9b6836d0aaa1540d8