Malicious PDF — malware analysis report

Static analysis result for SHA-256 e677f5890af826de…

MALICIOUS

PDF

50.6 KB Created: 2020-10-16 00:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b267ec203c3c2c2717969275e7807269 SHA-1: 6fe05e6067791d5ddfbd79d515c4d263b67e9217 SHA-256: e677f5890af826de3f951390fb45f0fb426f6afdec157b409b2443b3db6fed2f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to a 'driving licence form'. The ML classifier strongly indicates maliciousness, and the presence of many external PDF links suggests a link farm or redirection strategy to deliver a payload.

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://gettraff.ru/123?keyword=driving+licence+form+delhi+pdf In PDF document text
    • https://site-1040881.mozfiles.com/files/1040881/22176700123.pdfIn PDF document text
    • https://site-1040374.mozfiles.com/files/1040374/29199603631.pdfIn PDF document text
    • https://site-1041942.mozfiles.com/files/1041942/recyclerview_android_example_step_by_step.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5f8745e547a26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373004/normal_5f88bb65607ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366620/normal_5f88bb1970ba8.pdfIn PDF document text
    • https://mogezisatizate.weebly.com/uploads/1/3/0/7/130775403/wuresosiv_wetirasovokoz_firotitajiwod_padeve.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/fubisi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369784/normal_5f88bf55d7d7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365608/normal_5f86faa49045f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_5f875ad249435.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367305/normal_5f88b8583524b.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/1/0432/6090/3582/files/26511453394.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0222/3013/files/88898894062.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8150/8022/files/clinical_pathophysiology_made_ridiculously_simple_1st_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5153/9866/files/nutonelikukuxo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7105/2703/files/dazomuz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6897/2444/files/rabutatomumosifuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9789/2030/files/tidukajuwag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1905/9868/files/bob_the_robber_unblocked_games.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_off000088d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88D0 5240 bytes
SHA-256: 6c87cf28cc86abbd021b9134e873b83c40bd2a06ad775f8d7e6287139ec1bdc2
font_01_sfnt_off00009a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A81 10100 bytes
SHA-256: 94bfc51a616e7561facb1f61a8c84c682ed59c9646a432b18b9877236876ae99

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