Malicious PDF — malware analysis report

Static analysis result for SHA-256 27881d8ac1214972…

MALICIOUS

PDF

63.7 KB Created: 2020-08-23 05:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a4b5d97c753cd5e010e8c0badb94bee3 SHA-1: ae764ce63af21f6d529c2e76dffa2ea7d7bfaf32 SHA-256: 27881d8ac1214972044953a238b172e18eefb99688d90fdcb3882294b0a37731
194 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final destination or serve malicious content. The presence of a large number of PDF links, many hosted on Shopify, suggests a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness.

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=bach+bwv+846+sheet+music In PDF document text
    • http://files.redpicachomining.com/uploads/1/3/1/8/131871597/8971245.pdfIn PDF document text
    • http://files.southviewcaravansite.com/uploads/1/3/0/9/130969332/jubosoxinojamizipino.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/1/0430/8680/7201/files/seliwafosejiribipezabu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6365/7119/files/intercompany_sales_process_in_sap_sd.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7450/2312/files/18756400352.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9231/1206/files/56904964908.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7560/9510/files/gulafakixeboloxikapujiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8852/8035/files/chapter_5_time_value_of_money_test_bank.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/8215/7981/files/current_resuscitation_council_uk_guidelines.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9560/3880/files/basic_language_commands.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000096e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96E5 5688 bytes
SHA-256: acda892b9ee5ae3a34767f20a11f7abe406b0de8217dfb9e295c9af0d2325309
font_01_sfnt_off0000aa40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA40 15536 bytes
SHA-256: a4b7ae902b9555d0f223b0fda636a62e4d4d476c344d348aa10117f98333f44d
font_02_sfnt_off0000db2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2F 16120 bytes
SHA-256: 46d9b83afd797048ab251ddfc9ca9a6db44f3280724c231f6a80a061bcc6fc12

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