Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a115f853f0b7c09…

MALICIOUS

PDF

41.9 KB Created: 2020-10-31 06:36:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b96f46996675d10cf541a069597e2360 SHA-1: 270f9eef4b564ace4c03a9e78a463e8bf48a6437 SHA-256: 5a115f853f0b7c099ab6188637225da8a27ef819b801d28eec76fad868e2bc1c
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with critical heuristics indicating it's a redirector and part of an SEO link farm. One of the primary links points to a known malicious redirector, and the document body itself contains a similar URL. The embedded links likely serve to distribute malware or facilitate phishing attacks, aligning with spearphishing attachment tactics.

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://ggtraff.ru/aws?keyword=good+teams+win+great+teams+cover+meaning In PDF document text
    • https://zanafuwidug.weebly.com/uploads/1/3/4/3/134353074/1bbeb.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/zanadutut_wexudafenatogun_jetomefoja.pdfIn PDF document text
    • https://zififawatef.weebly.com/uploads/1/3/4/3/134384507/kubavi-misujirubasek.pdfIn PDF document text
    • https://jazafojof.weebly.com/uploads/1/3/4/3/134310209/lasivivakaru_kitatalikotodo.pdfIn PDF document text
    • https://ranenowubugipo.weebly.com/uploads/1/3/4/0/134040983/dabona_mevarupimufeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6204/2532/files/jet_band_saw_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39f64bec-0c2b-4063-bc0d-2689a2a95f23/teranagitozojajibej.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/a_brief_history_of_chinese_fiction.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/biblia_de_estudio_palabra_clave.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/48000513513.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/neolithic_culture_in_india.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/9289/2567/files/dr_phil_personality_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/337e6f98-85f8-450f-b433-ca666f831a13/pojepumoxuvalodefexatu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da530b80-dd7e-4c07-a8b6-4d9b67c96cb7/31798154000.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000631b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x631B 5408 bytes
SHA-256: 826f25d926a1177b27ff67fe817c45867dd2f10e10e21d503becf0d9cd6f5ddb
font_01_sfnt_off0000758a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x758A 11012 bytes
SHA-256: 508a3312f581164e13132066bb28ba96031562f4be7e764efe1f3925c1af0d1d

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