Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a329eb03849f34…

MALICIOUS

PDF

43.3 KB Created: 2020-10-27 10:41:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 0f5c3ed4e750d2e4306704a741c64f52 SHA-1: 3a26f58a1f60394d34fa435804db7bd03e59386b SHA-256: f3a329eb03849f34569b2a1604682f03ec48bb5b0b4eea631bbf0f8e629daff6
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 significant number of embedded URLs, with one identified as a malicious redirector. The presence of a large link farm suggests an attempt to manipulate search engine results or distribute malicious content. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

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/strik?keyword=nocti+test+study+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4378167/normal_5f905d6b12db2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367667/normal_5f8d2d8bb0436.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380223/normal_5f8ce27832b6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408461/normal_5f93d3fd2d456.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366381/normal_5f8996a801a1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379849/normal_5f9771553ffa2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369150/normal_5f89f3bb0a91b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375522/normal_5f8feea9e3862.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/1/0428/8482/5247/files/goldman_fristoe_test_of_articulation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/7013/4693/files/fl_studio_11_crack_zip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/5088/4008/files/97097804114.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/2555/8425/files/482676263.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/cosmic_microwave_background.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/nuzesen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5153/9866/files/wozezegofinasujoras.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7447/8779/files/auto_manual_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/4195/5221/files/killer_bean_game_apk_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6035/3429/files/golele.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/2735/6577/files/45707970232.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/68931406362.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/17404309044.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/75926185005.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/36973204947.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/84000056795.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_off00006b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B94 4840 bytes
SHA-256: f3cfed81c38a735eee8560f2637793e6057794f02fbfa006da45f58ab5d58c9d
font_01_sfnt_off00007c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C23 10452 bytes
SHA-256: 5467e918babc38443e1d1cb4cbca9d7ded2ed1379d7ada0c0459387b26ce6f6b

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