Malicious PDF — malware analysis report

Static analysis result for SHA-256 882311aa58d2f993…

MALICIOUS

PDF

32.5 KB Created: 2020-08-25 13:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 39ea2c7f3732fd9b0a870cebb9195418 SHA-1: e52f435af42f06f505d3945ecbd573f9aefae2a0 SHA-256: 882311aa58d2f9937788569913c30e05aed7c0277ceb2dffb307502951108e6b
202 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirection and a link farm, including a critical finding for a PDF redirector link. The document body, though heavily obfuscated, contains a URL that appears to be part of a lure for 'Avast internet security definition update'. This suggests a phishing attempt to trick users into downloading malware. No scripts were extracted, but the presence of redirector links and the ML classifier's high confidence score support the malicious verdict.

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.ru/pify?keyword=avast+internet+security+definition+update In PDF document text
    • http://baduvov.jacquelinecutler.com/uploads/1/3/0/8/130814229/76e426f43da.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/1/0440/3141/0326/files/gavekevisasebapijer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6088/6694/files/89306112783.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1773/8152/files/academic_reading_and_writing_skills.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/lefof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5460/4198/files/95923085711.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6346/0508/files/painter_s_algorithm_in_computer_graphics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2659/3445/files/68422267386.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4909/0200/files/raul_prebisch_dependency_theory.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4122/5880/files/amsterdam_tourist_map_english.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0640/2453/files/38685437431.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0416/6297/files/vesesafema.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000430c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x430C 5268 bytes
SHA-256: c5cd8d2ef0754907e25d7c7199d9c99118c72c169ac46f011d3fa3b8599dc31b
font_01_sfnt_off0000550d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x550D 9528 bytes
SHA-256: 6f9ac58f1b09bbf454b0d183f12c0edb4cec9a981a8d7c1273dcd6daaa3bc61e

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