Malicious PDF — malware analysis report

Static analysis result for SHA-256 db25319e70dfc7ff…

MALICIOUS

PDF

51.4 KB Created: 2020-11-04 03:56:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0434309614e7ff1cab3fdfa4ef3f718a SHA-1: df94502f95771aeceb580b5d1b00be20be842f1b SHA-256: db25319e70dfc7ff345c2231aad8cac26269113f33f3b60ab5cf4a0adc9d0a90
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 1.0000

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://cctraff.ru/123?keyword=drawing+apk+pc In PDF document text
    • https://cdn-cms.f-static.net/uploads/4401989/normal_5f91e0fcae187.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384304/normal_5f9c3e026fe26.pdfIn PDF document text
    • https://gasipepimajut.weebly.com/uploads/1/3/4/3/134367512/wirave-vovobokodojob-fepubepobumex-warenijo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381752/normal_5f8d2e08e6946.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369932/normal_5f8973920857b.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://uploads.strikinglycdn.com/files/ded5adb5-2acf-472d-acef-bd4f697715b0/70917993008.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7607d05a-0659-4a8d-8178-2f610578813b/71136480174.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7444edb6-151d-4bd0-9cf1-19e361fbb9c3/52528981905.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/040f0383-b401-462f-9697-6866537e2fbc/17412304926.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57195258-5d02-4077-be8e-1786c2a81d2f/southside_concert_venue_pittsburgh_pa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6c530ed-1931-4183-af51-811a7a4f7f3a/nefixifefekukago.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/mount_kelly_kindergarten.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_off00008079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8079 4528 bytes
SHA-256: 647722cc0b765b50e7a98e83750b80b511242d50d1298bb9abc228a0f2797b98
font_01_sfnt_off00008fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FE6 10532 bytes
SHA-256: a069b2396462768c54e0a1146406e9ebd3b3c7dc2de1bda7a57b87f9054bd8e9
font_02_sfnt_off0000b31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31A 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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