Malicious PDF — malware analysis report

Static analysis result for SHA-256 631d93bed3c92a12…

MALICIOUS

PDF

42.2 KB Created: 2020-11-02 15:08:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ab20dbce450f3ae46689445009addc21 SHA-1: bad9f971fcfcf433abe360f861e63f5e64ed710e SHA-256: 631d93bed3c92a12b3b4c399f8f285b58c99adc9d2b80d4be34f9512cfed3e7c
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://gettraff.ru/strik?keyword=gta+2+android+apk In PDF document text
    • https://xukutejupu.weebly.com/uploads/1/3/4/4/134487517/beligedotazejiwogani.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366399/normal_5f872dfac4896.pdfIn PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/e35b477.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7bfa122-af1c-492e-899c-a3447511048f/vuruvel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53e20dfb-ca16-4c3c-8130-d298021427c6/naresexove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3993159c-5c46-47ed-859c-7d77f36e2ad3/kewoji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55f5891a-bf89-4365-87a7-70f6752ffdfb/70334691872.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1899ee98-af13-4f0c-9be3-72b64c7680dc/fnaf_3_map_minecraft_1.12.2.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E73 4972 bytes
SHA-256: 59c14a29ee0a5f01a6a720a70f129f67e980cd7611c3fb475f9340f590d451ca
font_01_sfnt_off00005f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F74 10096 bytes
SHA-256: efc862bf4bfaaca2157bc01d050a3ae60a14763eb82fcbfda0b9c2758fbb4052
font_02_sfnt_off0000822f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x822F 17552 bytes
SHA-256: cd380a36d14c149dec3422ccb2bce33d52b60448f8c57ea12dcfe7b992ed6a3a

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