Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b77bc4e6e69a2ba…

MALICIOUS

PDF

41.8 KB Created: 2020-10-31 08:49:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5d5a0899c9050bb25f126287f77bc7fb SHA-1: bf0a22ef5cfd958adfa0d3e69444112f6499c081 SHA-256: 0b77bc4e6e69a2ba80af26021cf975f5a5a28991cdd0ec90af1a8418f432aeb1
202 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm designed to direct users to potentially malicious sites. The ML classifier strongly indicates maliciousness, supporting the attack pattern of using a document to redirect users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?keyword=eu4+florence+to+italy+guide In PDF document text
    • https://miwilokak.weebly.com/uploads/1/3/4/3/134375457/gawosizov_gufavikutujeze_dukiza_ridezugedeleguf.pdfIn PDF document text
    • https://kidunaxu.weebly.com/uploads/1/3/1/4/131437100/8737190.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366377/normal_5f8734aa65ed8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408584/normal_5f944dcba583b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tadovu/japanese_sewing_pattern_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f866ff02-e4d6-4ff4-b000-c26f0f66ba9e/40142603033.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/hebrew_alphabet_script.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/quarterstaff_techniques.pdfIn PDF document text
    • https://s3.amazonaws.com/lopazura/hp_laserjet_1536dnf_mfp_troubleshooting.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/refraction_of_light_class_10.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/foxufati.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/britax_marathon_car_seat_2014.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/traduire_un_document_anglais_en_francais_gratuit_en_ligne.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/zizunuxodokodavawepatetu.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/love_story_in_english_file.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_off000061a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61A5 5156 bytes
SHA-256: f2c8b364101656e889189c3cab9c77d4d2e720b4eaa02b4d4e701dc38102f25e
font_01_sfnt_off00007358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7358 11776 bytes
SHA-256: b27c498209432af9546df035aae84a948099edf777610b5d50841dd980aec2b6

Open this report in the interactive analyzer, or submit your own file for analysis.