Malicious PDF — malware analysis report

Static analysis result for SHA-256 138dc4a5574f911c…

MALICIOUS

PDF

47.0 KB Created: 2020-08-24 02:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c74117044ba341045e1dcb9b220165b7 SHA-1: fda3298c75e7c61d3e2b3e4385306c6c99704f36 SHA-256: 138dc4a5574f911ce8202e4ebed43dcac09f615d700daa0f8abe5058fbd5a2fb
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many of which point to a redirector service designed to obscure the final destination. The primary redirector URL, 'https://ttraff.com/pify?keyword=expressvpn+unlimited+secure+vpn+proxy', is flagged as malicious and associated with SEO link farms. This suggests a phishing or scam attempt, likely using a lure related to VPN services to entice clicks. No scripts were extracted, but the structure and embedded links strongly indicate a malicious intent to redirect users to harmful content.

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.com/pify?keyword=expressvpn+unlimited+secure+vpn+proxy In PDF document text
    • http://files.x-amvip.com/uploads/1/3/2/7/132712127/sefiratuxu.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/1/0432/4311/0564/files/patorekovatisaselaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7448/4379/files/nunozipumisanuwopozenu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6989/8913/files/capablanca_s_hundred_best_games_of_chess.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3716/2646/files/19149239994.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9994/5112/files/63508261307.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4678/0566/files/dawefixolewiregupa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8447/9641/files/math_binomial_theorem_solution.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kiwovanigefuminif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7655/8746/files/bww_lunch_menu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/pifasaz.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 3

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_off0000630b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x630B 5196 bytes
SHA-256: 15724260267d3e2acbadd5faa6d30bf52e7dc5af7cc8a791d3db05c4683b00be
font_01_sfnt_off000074b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74B0 10428 bytes
SHA-256: 9eafe36cbb4a41c22739b6ea6ea42d9443ccbf64f515f89d4a007fb027031d54
font_02_sfnt_off00009888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9888 16616 bytes
SHA-256: fcf5cf03075fe45ee1aa9e10002794be2d4aa61427b5695c4cb84c7bc7f55281

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