Malicious PDF — malware analysis report

Static analysis result for SHA-256 306755d925f45ae3…

MALICIOUS

PDF

59.1 KB Created: 2020-10-30 19:48:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9791ff9ae9e256868d18c1301e93cb8f SHA-1: 84c4e0aa8bde5b0a30024693061c04c8cc2f3471 SHA-256: 306755d925f45ae3271c2d686cb637e8f04014ea79b489368a29582138b5d014
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though partially corrupted, includes the same URL, suggesting an attempt to lure the user to malicious infrastructure. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this file is part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • 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://ggtraff.ru/strik?keyword=.40+vs+9mm+ammo In PDF document text
    • https://fidevawane.weebly.com/uploads/1/3/0/8/130814252/2562645.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/jotizifime/master_of_orion_ship_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/4060/1754/files/8th_grade_common_core_math_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/erico_cadweld_molds.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/ncert_class_12_biology_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/189e704c-402c-4328-b584-a3c925baa179/chew_on_this_chapter_6.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/characteristics_of_annelida.pdfIn PDF document text
    • https://s3.amazonaws.com/welutizenop/monument_14_sky_on_fire_characters.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/retrica_e_argumentao.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000b606.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB606 24260 bytes
SHA-256: d78bc81744c03c0727313ab23bc669a19c05e0b7c75f9bc94c0885e7dbea5966
font_00_sfnt_off00007f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F37 5084 bytes
SHA-256: 853b7664a73838d3a0f75a51a5dea4ce070577fd14fc9923a09fdda066efb5ab
font_01_sfnt_off0000907d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x907D 10976 bytes
SHA-256: e143f7e4d0718e4f91e1542e0686e8d4b7f16c6a46aed1a4cf0fc7bf14a82d41

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