Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e21bae4aa1ced51…

MALICIOUS

PDF

42.5 KB Created: 2020-10-27 07:56:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 36827f8bd7eb24840908aa6259350983 SHA-1: 96d99ebea057b66a6c36abb0cbaf58c514afa391 SHA-256: 9e21bae4aa1ced51b0ec8b007054f94e8cf4846ce6a3b7f03cb3f290ed2eb808
174 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.club/123?keyword=wsop+2020+schedule+cancelled In PDF document text
    • https://dowamiwimeguv.weebly.com/uploads/1/3/0/7/130775936/dikar_kujarezodeg_jolunaxune_sezisumife.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378852/normal_5f8a8a94d3dc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366047/normal_5f872f56d9ce6.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/1/0495/5255/6184/files/the_world_of_scripting_languages.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/3988/9852/files/6550465249.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0314/9479/files/64967618465.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/7171/4491/files/bevalovijaparadirenilab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6259/9584/files/cochlear_australia_phone_number.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/34706062647.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/chokher_bali_uponnash.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/55655366683.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/polititarixuladimuliluti.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/76581296527.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/92310520763.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/71350272212.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/camera_lenses_types.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/body_dysmorphic_disorder_a_treatment_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/acta_constitutiva_de_una_constructora.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/nato_phonetic_alphabet_printable.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_off00006556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6556 5352 bytes
SHA-256: 08cf6425a0965245bac0c4fa3ee28f4b062560b5c0844c63d8c51af1012ab76d
font_01_sfnt_off0000778e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x778E 10968 bytes
SHA-256: 9ef196a91deb6671503508572464e958ceb7d3fedc9c48fff865449bb8f2b5e4

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