Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a945d1e5e757723…

MALICIOUS

PDF

49.0 KB Created: 2020-10-29 22:34:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 143b805c6341e1d293f8e087c87e5b79 SHA-1: 7a49deb4356a96315c2f73e88ef72e1fd27fa0d1 SHA-256: 4a945d1e5e7577235378eacb5429cb05d0280be4690fa8a6e9d7d109c9dfd25e
174 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/123?keyword=zte+phone+charger', which is also present in the document body. The presence of a large number of external PDF links suggests a link farm or SEO manipulation tactic. The 'SE_CALLBACK_LURE' heuristic indicates the document may also prompt users to call a phone number, consistent with phishing or tech-support scams.

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.com/123?keyword=zte+phone+charger In PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/4892010.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/1/0504/3571/9358/files/14142208036.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/baduvi.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/nazizi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9cedb55-16dd-4c91-8d4c-bdbe1a7672b5/dewajafobinaxirudi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d539e3f9-c109-4622-9a59-8667d2537bc9/35791770735.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6961/1932/files/rupekufuwex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce797404-c41b-4b83-b033-96256064bc37/poxuwatidiwumifovobepawi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8592/9375/files/box_napkin_paper_towel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1270/1854/files/xiaomi_mi_a2_camera_manual_mode.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/2412/9437/files/nejedumatezonivikunigo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/0540/0990/files/backup_sms_mms_android.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74AB 4680 bytes
SHA-256: fd73f325a597c17faa0ebd2d628a195fb335b314d86d596e8f258b95bca1c3b6
font_01_sfnt_off00008484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8484 10720 bytes
SHA-256: c51ef6135d63a17770bd46c027a90e36560dda437c65ecb493fa14a801fe3255
font_02_sfnt_off0000a905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA905 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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