Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a6f3143d4956ec…

MALICIOUS

PDF

36.2 KB Created: 2020-08-07 05:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: ca8efd4319384b8f8d8d093b3836ad5f SHA-1: 6b3353424fd9daff2198490fef1772131cb1a22f SHA-256: 18a6f3143d4956ec97b246285f3157fa86848b061b09a18e5af8824c290fe47d
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 (ttraff.com) that is flagged as malicious. The document body, though heavily obfuscated, contains URLs that appear to be part of an SEO link farm designed to lure users with promises of free book downloads. The ML classifier strongly indicates maliciousness, and the overall structure suggests a phishing or malware distribution attempt.

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=de+cero+a+uno+libro+pdf In PDF document text
    • http://files.artintheiron.com/uploads/1/3/1/4/131438557/sabokonex.pdfIn PDF document text
    • http://files.zsofia-opraszabo.com/uploads/1/3/1/4/131407164/5417010.pdfIn PDF document text
    • http://files.csungsf.org/uploads/1/3/0/7/130776487/769c4.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/1/0433/2063/9646/files/tipeluzasipuvepeliv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7795/9833/files/84975471011.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0755/8310/files/vamizeroki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7663/2214/files/bugafetugoja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6214/0840/files/77818918800.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2161/5772/files/dajug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4100/5480/files/67033183714.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0364/9954/files/66247341782.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6624/4766/files/42290635177.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2186/8960/files/17573339009.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/3577/6408/files/snow_white_and_the_seven_dwarfs_brothers_grimm.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

Related samples 4

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4EA0 5112 bytes
SHA-256: 85aacd86a186513e059a3bdf226f8fbd53923468fd266309560c4f44319bfa3e
font_01_sfnt_off0000600e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x600E 11180 bytes
SHA-256: c86d1cb967c78a25473ee2a06df592ab89b6e6a746073dcb922a77c00fc6ae29

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