Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a6c391b29a3c342…

MALICIOUS

PDF

51.7 KB Created: 2020-08-08 08:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 21d3ccd10883449d00c5908bcd85f7dd SHA-1: 68b12b0a440734fa37eb8c16a3bae2faadc7bc65 SHA-256: 1a6c391b29a3c342e40112e71cf27d81ecc8a65ec44b792b6b33714717c1b07c
202 Risk Score

Malware Insights

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

The PDF contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits a PDF link farm, with numerous links pointing to external PDFs, many hosted on Shopify. The document body, though heavily obfuscated, contains a URL that matches the redirector heuristic. This suggests the primary goal is to redirect the user to a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • 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.com/pify?keyword=advantages+of+multilingualism+pdf In PDF document text
    • http://files.mrsstoddardsiewclasses.com/uploads/1/3/1/4/131437657/1677181.pdfIn PDF document text
    • http://files.lucynthiaent.com/uploads/1/3/0/7/130775998/8e47c71379c1.pdfIn PDF document text
    • http://files.fridayflyfishing.com/uploads/1/3/1/4/131437402/guvis.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/1/0440/5932/8662/files/form_ssa-_521.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6552/3870/files/85754455125.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8904/3358/files/dofirenosololezijakiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4704/9621/files/cantares_mexicanos_miguel_leon_portilla.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0348/5092/files/sivevigukew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5349/0071/files/wobufifazidimajuralabe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3478/5430/files/lukatofujusutaluwo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7347/8560/files/32495349487.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9914/2810/files/jixegakawinomonesovoj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7318/3643/files/65322422222.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 8

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_off00008144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8144 5312 bytes
SHA-256: 826032a56f71d17188d8a7ccb3bc4306dcdbd9f78fe92e39c56378239b16b827
font_01_sfnt_off0000934f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x934F 1800 bytes
SHA-256: 6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee
font_02_sfnt_off00009bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BDF 11156 bytes
SHA-256: a0b420960d7f0ce26a49d9838245360faea8ec9d52d60331cdaa2850cc2716fc

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