Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8586c5787f3da28…

MALICIOUS

PDF

41.6 KB Created: 2020-08-07 04:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: bcbb96b811ac8c0b994f40e391650adb SHA-1: a075394c9acf236c5d9ff5c2f5d506640cc88547 SHA-256: a8586c5787f3da281c11bf0891b8fd4b4dbcd17bf92189769702501d92841407
194 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many of which point to external resources. One critical heuristic firing indicates that the PDF links to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that triggered this heuristic. The presence of a large link farm suggests an attempt to manipulate search engine results or to distribute malicious content through a variety of seemingly legitimate-looking links.

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/pify?keyword=evento+cerebrovascular+isquemico+pdf In PDF document text
    • http://files.alisondowell.com/uploads/1/3/2/3/132302982/bokiboxuzakejut_zutowo_webifisajod.pdfIn PDF document text
    • http://files.klbavarianwaxart.com/uploads/1/3/1/8/131856713/0e35d0df837e.pdfIn PDF document text
    • http://vefipawos.hellosquatch.com/uploads/1/3/1/0/131070374/xelegomivix.pdfIn PDF document text
    • http://files.seohye.com/uploads/1/3/2/7/132740375/tisuvenowidatik_pumosuje.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/1/0436/3105/0915/files/tozek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1090/6518/files/53967608457.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5817/3854/files/60055761629.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6801/5260/files/51762891878.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8521/7436/files/46772869789.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2105/7700/files/31268686607.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7792/7063/files/ruturegumodiponudivafize.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4431/5029/files/69324127972.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9165/6864/files/break_my_heart_again_piano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2348/3548/files/47216322682.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/minecraft_scoreboard_command.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 6

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_off00006468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6468 5584 bytes
SHA-256: 518cdbaa2f5bfbb44494b626279a6b54bd4396d76bfe6d643c585a29b7491ed0
font_01_sfnt_off00007750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7750 10052 bytes
SHA-256: a53a52b6afe43ecdcdb2c4fcd6aa29ecb8faaff6b4410a22f8639fc8f723eb52

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