Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5142de43af61662…

MALICIOUS

PDF

38.7 KB Created: 2020-08-02 15:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4a17f045cbc581c2126d92eb4a67d2cf SHA-1: 01cf031584c3156a8fdbbf8a693af834bb1ee3ea SHA-256: a5142de43af61662e307f0aea2310bd1d20643a35dbb2d3ed6150a3feb7e8d72
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link, directing users to a URL containing 'computer virus tutorial'. It also exhibits characteristics of a link farm, with numerous embedded links to external PDFs, many hosted on Shopify. The document body, though heavily obfuscated, contains a reference to the malicious URL. The presence of a password-protected archive lure suggests the PDF is a delivery mechanism for further malicious content.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/wb?keyword=computer%20virus%20tutorialspoint%20pdf In PDF document text
    • http://files.peterantor.com/uploads/1/3/2/7/132740598/gigedo-xonas-debigulifafefil-kebofaji.pdfIn PDF document text
    • http://files.jurongdistrict22.com/uploads/1/3/0/7/130738596/2972831.pdfIn PDF document text
    • http://files.bluffsplus.com/uploads/1/3/0/8/130814460/53b61b.pdfIn PDF document text
    • http://files.myenvisionphotography.com/uploads/1/3/2/6/132681634/baxupezugivef.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/1/0428/3393/6547/files/movomozoleritawabiveposob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8694/6206/files/fovid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7000/4126/files/fugavox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6761/3082/files/gusigetijebela.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4291/3952/files/17028204967.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2191/0694/files/muronedonaborib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9520/3745/files/kevawovazutadixaman.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/1670/5432/files/78592786300.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/72376703515.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4093/0983/files/lulisawitunirifisutuwodul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2574/3515/files/xajofawunir.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_off00005cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CBC 5152 bytes
SHA-256: 32f7a222aac2e6ff993054fb9da25879bfb66f3331f6b174422e89ddb111a110
font_01_sfnt_off00006e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E27 9304 bytes
SHA-256: a96321252d0c1af4e62fdd11708c69c4713a6d08328345ad15bed9a2872f0f27

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