Malicious PDF — malware analysis report

Static analysis result for SHA-256 b541df77e074f075…

MALICIOUS

PDF

44.5 KB Created: 2020-08-12 09:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 58399c8f07d359889fb4a47e86bbd4b9 SHA-1: fad2fa3fefd5ec57226e35ce80fd0cb5b2add260 SHA-256: b541df77e074f075b1a0314b96305bb3a797986c30df085119a9f305aafa129b
194 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to what appears to be a link farm hosted on cdn.shopify.com. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure via 'ttraff.cc'. The document body, though partially corrupted, contains text related to PDF annotations and the authoring application 'wkhtmltopdf', suggesting a deliberate attempt to disguise the malicious nature of the links.

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.cc/pify?keyword=define+annotation+pdf In PDF document text
    • http://files.sirjohncassprimary.org/uploads/1/3/2/7/132741322/2533994.pdfIn PDF document text
    • http://files.rainadance.com/uploads/1/3/0/7/130775679/8846183.pdfIn PDF document text
    • http://files.kathysnow.ca/uploads/1/3/0/9/130969254/7718378.pdfIn PDF document text
    • http://files.stpetersindy.org/uploads/1/3/1/3/131380063/aa5daeec.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/1/0447/8337/0397/files/suwagoroxog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4323/2661/files/furoxabepe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/lubuvijaxefupibofad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57955619809.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6091/9462/files/94690600180.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9819/3566/files/24204709819.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0786/8060/files/kerberos_network_authentication_protocol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0452/1204/1367/files/bee_gees_how_deep_is_your_love_chords.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0742/7238/files/tabimewazosiwekujow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5533/3027/files/fuliwiwujolazofifikegoxuv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2839/7732/files/atos_e_contratos_administrativos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4389/4934/files/42026845478.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4576/3744/files/kupuwavulo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sabam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2674/9339/files/dixizobigilozodekifojejam.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_off00006c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C0F 4728 bytes
SHA-256: 4957c26e75fe0265340547e3c375bdc43823aa771fc30f93604a8e6559b26656
font_01_sfnt_off00007c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C42 12216 bytes
SHA-256: ec9881b95dbad1a66ab5cb48599f6250f3217dd141dd5f2cc868a8e1786086e7