Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3e373410ee038c…

MALICIOUS

PDF

44.4 KB Created: 2020-09-01 01:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 2b777e5e350369d843b37c6d4e0c6cc1 SHA-1: 72794577c2d7f6ae5de3d8bb4c8867d82911f9ab SHA-256: 4c3e373410ee038c2cc6d838c45b737a590df2b95d1b064f7f56a6ee988efcbf
194 Risk Score

Malware Insights

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

The PDF contains a prominent link to `https://ttraff.ru/wix?keyword=fisheye+lens+camera+app+for+android`, which is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and numerous other links to PDF files hosted on `static.usrfiles.com` and `cdn.shopify.com`. This suggests a link farm or redirection strategy to obscure the ultimate malicious destination. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it's part of a phishing or malware distribution effort.

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/wix?keyword=fisheye+lens+camera+app+for+android In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/01bc73_db4760cd263b4e8ba6e930f75f6ecf68.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_9697dd7740e74475badebf05d2c73e82.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_255cab9218ea446897b28ca64baf0d1b.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/1cc7e8_cca87b491ae647a5885fba00f5292124.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_b93d950c2a7e4f6da9e99500f0a1e7d0.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8567/6188/files/vugegurilulamiwuworuvox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4062/8136/files/mavuvotujezapej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8515/1897/files/14118670023.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1386/4602/files/fuvewoxevep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5185/0647/files/bach_prelude_cello_suite_1_guitar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3860/5461/files/java_dead_code.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 5

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_off000063ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63BA 5452 bytes
SHA-256: 46b60958131f6df270c78b564c3d80d0266f7d11695113df1befadfa6e471219
font_01_sfnt_off0000761e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x761E 2188 bytes
SHA-256: 8243a2978354b99ad9fc1765d3878328d49e2998d0a5549394a0bdfef85e0506
font_02_sfnt_off0000803d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x803D 10160 bytes
SHA-256: b19517b8e94cf7c4adae3675bc21481e9ad785b6755aca294798a94de607cde5

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