Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cae04fb92bf0e16…

MALICIOUS

PDF

65.2 KB Created: 2020-08-14 10:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5ab56231ad0ba2a71fc58c21fc605c48 SHA-1: 250c985b1c1f774eb846e9182ec4f85b679e18e7 SHA-256: 1cae04fb92bf0e16c4754fa546e08aaf1cb3922444012f0154fea63a0ff53335
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a lure for search engines ('Idioms with their meaning pdf'). The primary malicious IOC is the redirector URL, which is likely used to funnel traffic to further malicious sites or for SEO spam.

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/wb?keyword=idioms%20with%20their%20meaning%20pdf In PDF document text
    • http://files.phoenixyouthfc.com/uploads/1/3/1/0/131070483/jupesu_zabidar_sekelodaf_nataveta.pdfIn PDF document text
    • http://files.madisonhousingsd.com/uploads/1/3/0/9/130969801/9081598.pdfIn PDF document text
    • http://files.zionarchitecture.nz/uploads/1/3/2/7/132712358/fenutadu-vukog-tufivi.pdfIn PDF document text
    • http://files.mx.autumntheodorephotography.com/uploads/1/3/0/9/130969480/wobozixuguzasag.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/1/0446/1549/9939/files/harry_potter_cello_sheet_music.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4939/4080/files/65330858138.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5664/3739/files/biosynthesis_of_terpenoids.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3049/4878/files/fikikuvakarupuwoxijor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0445/8138/8452/files/5716339699.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8764/3302/files/38735191057.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2579/1138/files/zevuxebolarowasifeza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6795/7660/files/88122382664.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3161/6923/files/vewufevovojabeniliv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mofofuledezenededur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/add_artboard_illustrator.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3948/2275/files/javascript_template_literals.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/jejixosijuvukolopusifa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5197/3794/files/concept_of_human_development_in_psychology.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC19A 5452 bytes
SHA-256: c6b389abed30bdc19872ec402e739fcbaa4bcb9b7ab00c3ca3cc0cc4933c342a
font_01_sfnt_off0000d417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD417 10352 bytes
SHA-256: 0f18744138146fbbc4ef6e05fd14a5c5460fcb7f556510c34e65f6cef7a4ec6e