Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf65bc4a5a8ac5b8…

MALICIOUS

PDF

41.7 KB Created: 2020-08-22 08:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 1d0a5eccc5e50251b2bed0c5b9a06b6f SHA-1: e66cb2d7f891d4e2f59a5916f371080fcd0a0f07 SHA-256: cf65bc4a5a8ac5b8bc9a8a37cf7ec9b3e9f287b20d3414e6442570529bc56afc
242 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link and a large number of external PDF links, suggesting a link farm or redirection attempt. The presence of a 'download button' heuristic further supports the lure of clicking a link. The primary malicious URL identified is ttraff.ru, which is known to host redirectors.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=video+er+for+pc+filehippo In PDF document text
    • http://xekib.boudoirbyadrianaroquephotography.com/uploads/1/3/0/8/130814328/f9d0c39b4531.pdfIn PDF document text
    • http://gevejovo.peakperformancefitnesstx.com/uploads/1/3/1/4/131453850/6438542.pdfIn PDF document text
    • http://files.alpsed.org/uploads/1/3/2/8/132815388/ledivusawete.pdfIn PDF document text
    • http://files.minnesotansagainstpuppymills.com/uploads/1/3/1/6/131606798/nalewil-retumi.pdfIn PDF document text
    • http://kevitap.susansimons.com/uploads/1/3/0/9/130969077/ganejizivewesi.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/1/0437/3826/7809/files/annabac_francais.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/98908457197.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5351/3881/files/vawaxusire.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6717/1223/files/nudagojodipevoxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4267/6648/files/73732886814.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5251/2918/files/12174438617.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1407/9143/files/64021804058.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0453/9131/5112/files/74167359461.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9088/6312/files/gegorotedabidakaf.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_off00006771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6771 4820 bytes
SHA-256: 80eec76618797f9af562aebb3f65a0ff87aab3242da772221b436f3a699ecec2
font_01_sfnt_off000077ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77CA 9896 bytes
SHA-256: dd2fd25ca9cb226bb0506ca86184e6274a67e6b875b837627cd18dd28816c1f7