Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae8b3d2725e83cc…

MALICIOUS

PDF

48.0 KB Created: 2020-11-01 00:15:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4f286dbfbeae4362f205accd48378cff SHA-1: 71896392eb41066db87b68f92aa0faa105d55eb2 SHA-256: cae8b3d2725e83ccd4b9f26348db4b1f140df29104aaba0780835c11e497854e
94 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/123?keyword=representation+of+integers+worksheet'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of a malicious URL within the document body indicates an attempt to lure the user to a compromised site, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.cc/123?keyword=representation+of+integers+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374368/normal_5f945e7335871.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392457/normal_5f90ced0ddd6d.pdfIn PDF document text
    • https://vaxajiwozoli.weebly.com/uploads/1/3/1/6/131637631/9844007.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/1/0493/6715/4847/files/remini_photo_enhancer_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/29513339835.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/3625/2609/files/87846436013.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3938/2430/files/55541975235.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/11721319961.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/jojerizafusifexita.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/6206/5828/files/pokemon_go_latest_apk_download_jktricks.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3540/1112/files/perfect_world_mobile_dungeon_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8140/8416/files/kigesosofisivakazufumad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7257/8220/files/padiwixamewanub.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_off00007015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7015 5080 bytes
SHA-256: ea678d91236c0c5d8ab42f9e1bc4bf1a44cd8b3c872ae3ad3516abf88799dc35
font_01_sfnt_off00008169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8169 10588 bytes
SHA-256: 563a6a93cc7030125d74586738818b87f97cdc56a84961a7a5e7231d9ceecf9b
font_02_sfnt_off0000a53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA53D 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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