Malicious PDF — malware analysis report

Static analysis result for SHA-256 f321a0bdb3e78f6e…

MALICIOUS

PDF

42.0 KB Created: 2020-10-26 18:05:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 86bc2cb8c827baee8da6f535e7b9bb8f SHA-1: 35315e440a0dd83d61b85e8b9ce46319aa7dc54f SHA-256: f321a0bdb3e78f6e2c6c3424e1ccb81fc0574de17ac79b2bc7b16acb175324f3
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various platforms. One of the primary links directs to a known malicious redirector, indicating a phishing or malicious content distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.com/123?keyword=compound+complex+sentence+structure+worksheets In PDF document text
    • https://tunomofezu.weebly.com/uploads/1/3/2/3/132303147/901e3e6a23a3ffe.pdfIn PDF document text
    • https://nukewixe.weebly.com/uploads/1/3/4/3/134385223/jisofefawo-fimop-sisigukaw.pdfIn PDF document text
    • https://vawotitalu.weebly.com/uploads/1/3/2/7/132710714/wemes.pdfIn PDF document text
    • https://merebidoso.weebly.com/uploads/1/3/4/3/134344951/gadujedubusilib.pdfIn PDF document text
    • https://rajaxamakato.weebly.com/uploads/1/3/2/3/132302926/6036598.pdfIn PDF document text
    • https://jopalezaleloloj.weebly.com/uploads/1/3/1/3/131380469/wagonagemodokaj_rogejap_vunisosiwo.pdfIn PDF document text
    • https://kesevaze.weebly.com/uploads/1/3/1/3/131383297/wijedigu.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/0927a8ce-366b-429b-aa9a-b94551c65f7c/lipaziwipolasokaduneluxax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33aff4a5-5313-4ba7-a166-8ddd7305c132/sawebagetudezufutuwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab8e889b-7945-4600-a91e-5f5d46ad0c23/96982189975.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c15830a6-15c5-4f0b-8325-f4663dd31432/66351994457.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8134/3903/files/spongebob_games_free_download_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7548/5339/files/26957940771.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6957/8147/files/jamie_easons_livefit_12-week_trainer_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/alvaro_siza_book.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/atividades_com_numeros_em_ingles.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/nawapum.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/wogubapu.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/fikesubu.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_off0000636d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x636D 5232 bytes
SHA-256: d9cf8da6c0e58414d944b5a4df347d676bca052577316be7d931ddef99fecc54
font_01_sfnt_off00007520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7520 10376 bytes
SHA-256: 7260c5fe796cd32f4c0186b60f961e5d793e203eb4305d658aaba77e19e0d169

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