Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9455afeb5d05295…

MALICIOUS

PDF

70.1 KB Created: 2020-11-01 19:25:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 2f0c686f10fc7cefb7f0e3a596a17aed SHA-1: 87b8c7fc4d6eab6c12d166ad227eefc430dcddd7 SHA-256: a9455afeb5d05295c7e6069195288c070293a7a24fbbc19ab6f6369a1e18a239
162 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 and a large number of external PDF links, suggesting a link farm or SEO abuse. The document body also contains a call-to-action phrase and the malicious URL, reinforcing the lure. While no scripts were extracted, the presence of a malicious redirector and the structure of the PDF indicate an attempt to lead the user to a malicious site, likely for further exploitation or phishing.

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.
  • 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.me/123?keyword=acid+base+neutralization+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4402737/normal_5f97c08fa2480.pdfIn PDF document text
    • https://zutofamofiselas.weebly.com/uploads/1/3/4/0/134040676/dalipiwejew.pdfIn PDF document text
    • https://revibafejinaj.weebly.com/uploads/1/3/4/4/134485322/duzisog-gugoge.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://s3.amazonaws.com/gebukil/lofuvodavufevaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2c46561-34e5-48ef-b492-1b00b5ee5af2/tefoluxepoludigotexezifib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9974/1596/files/24960909496.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70028fc2-0b8e-4fb7-b681-730ec384ad46/fasusejulowof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d218b201-0680-4be6-ac4b-1c6813e51bd5/72653004763.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1698/6534/files/daily_guide_waynesville_mo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/3118/6589/files/acute_coronary_syndrome_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/3640/9493/files/arabian_nights_full_stories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e301a83-77d7-44c0-8f2b-ad6c7bd19270/famous_spanish_short_stories.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/2851/9325/files/2687895981.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/2417/8072/files/button_background_color_in_android_studio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67822901-7d60-4631-8015-19638e4af06d/28753981726.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7102 26992 bytes
SHA-256: 35bb295e9310eddef83d214b6a62757c6dd872cb028375828efbbcd801ab7f45
font_01_sfnt_off0000c4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F0 5244 bytes
SHA-256: da24786ebc74f8141cef96e82aa4ad499aa6604d5b1c5ce5d42348ada5a67d98
font_02_sfnt_off0000d6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CB 11200 bytes
SHA-256: 69bf217d3afb544513b3ec2170b59413db2a0897dcff47a3d425fa86d4dc8f8c
font_03_sfnt_off0000fcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAC 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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