Malicious PDF — malware analysis report

Static analysis result for SHA-256 87954f3295c3be3b…

MALICIOUS

PDF

45.1 KB Created: 2020-08-09 02:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4941b8c03deacbb2aa1875acf678af82 SHA-1: fa7854b16a03db6fe30d903be89a050d1a398d12 SHA-256: 87954f3295c3be3b2e719ad90b9c665ad82da4cef14a258720b6c9329e184554
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and a redirector URL, suggesting a phishing or malware distribution scheme disguised as a free calendar download. The ML classifier strongly indicates maliciousness, and the embedded URLs point to known malicious infrastructure. No scripts were extracted from this sample.

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.com/pify?keyword=kalender+2020+pdf+gratis In PDF document text
    • http://files.jtoppbecker.com/uploads/1/3/2/6/132682684/4284736.pdfIn PDF document text
    • http://files.mindfuldoodles.com/uploads/1/3/1/4/131414743/1126048.pdfIn PDF document text
    • http://files.poetsanddreamers.com/uploads/1/3/1/4/131407135/faxapajavov_palevolo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5311/2735/files/43430348655.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6694/9786/files/bewizobagavezuvovatesig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4189/0208/files/93553584759.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1814/9285/files/java_ldap_example.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8268/6367/files/rodrigo_silva_o_ceticismo_da_f.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2515/3698/files/ocean_avenue_lyrics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1397/1861/files/woboxatojunagubelisu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5497/9477/files/common_math_symbols.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2229/3920/files/44516550497.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7995/7669/files/26047478140.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1712/6563/files/28948712586.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 3

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_off00006329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6329 5128 bytes
SHA-256: 0ab018082dba6accf02dac837a4eb3eb5ba1a8e8f75b67a0250ebac016f9d0e2
font_01_sfnt_off000074a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74A5 11244 bytes
SHA-256: 699f55fa87fa67447b3a56f2f3c5fadf1447dd04390ebe21412dccbbb99ec12f
font_02_sfnt_off000097e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97E8 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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