Malicious PDF — malware analysis report

Static analysis result for SHA-256 274b4dac0a670d8c…

MALICIOUS

PDF

68.8 KB Created: 2020-08-29 18:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 2623fdc75ceeb9c3b91a4278d5d77e58 SHA-1: a716d63c66edd5199404ee232f4e929d06916ecc SHA-256: 274b4dac0a670d8c20b50b11c2f12ef8a248e696582da7e44e2b0741131d1de6
194 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link. The embedded URL points to 'ttraff.ru', which is known to host malicious content. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same URL, reinforcing its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/wix?keyword=de+chica+de+chisme+on-line+2+episodi In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_a541db3b39ce40148e63eb2d5dc8aac7.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_590d85f9c2764883a46befadc1e87379.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_577d03c2bc6a44589703ca04f8528cd5.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_f2dd31e295c840e3af053e1176413e6c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_a537ae959a0645fc88f83c3f9f9ff5cd.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_a832a50151e8428ca01710cdf281340c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_2734c83abdf44af1a55532e2184037fa.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_c190b3b27dab4bada50a12c720818191.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/6944/6046/files/spring_framework_black_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2251/4338/files/b_l_theraja.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB03C 5380 bytes
SHA-256: 79d24975cc7ae26d8cbb8bbf615f391f84ae6e88f84c9cce864af02bdcbbe650
font_01_sfnt_off0000c269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC269 2044 bytes
SHA-256: e8def34ef7fa1cd1e737aa53281a1ad4be732a20e453453846aa670fb207f4af
font_02_sfnt_off0000cbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD6 10540 bytes
SHA-256: a2f716507abc5b4a878afaed420e2054a7440fbd0d59b936ce5c7acef975d4f0
font_03_sfnt_off0000f012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF012 16256 bytes
SHA-256: 5cc0a098be3c3d69c1a29f38d290257ea6d3f8831ddb8973840f244c00047237

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