Malicious PDF — malware analysis report

Static analysis result for SHA-256 303921d8fdc94716…

MALICIOUS

PDF

48.8 KB Created: 2020-10-20 17:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3c01829df7cd0e5ca04c69e901ae0554 SHA-1: 3d4d731132d325f4a447aa7e0c885657ea1b068b SHA-256: 303921d8fdc947161b273cc57237adb0e8e081a3c775d286cede66f908f0e5e6
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to lead users to malicious content. The document body, though heavily obfuscated, contains the same URL and references a 'post it notes app android' to disguise its malicious intent. The presence of numerous external PDF links suggests a link farm or SEO poisoning attempt, further indicating malicious activity.

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://ttraff.com/pify?keyword=post+it+notes+app+android In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369525/normal_5f8cec12635fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366035/normal_5f895f7cdfad5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374203/normal_5f8c3b490744b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367919/normal_5f88f27f5185b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368736/normal_5f89acb81e2b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384644/normal_5f8c9b538112b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380545/normal_5f8da151a24ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394061/normal_5f8eea6da9a02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378620/normal_5f8e90e0dd511.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/e57b17c6-24fb-400f-8e2a-0f8545ba82c6/baluvegimefijoda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54edcb79-c93a-403a-aed7-df008b7a4243/71835577260.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61127016-47a1-4eb6-b3b3-12290db7327a/41437370460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35b72120-ea28-430d-b171-d28c7f67b3f4/64195284735.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdb45805-f76d-48a6-815b-d5a4a71aa35a/23388933562.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8822/5459/files/xusatawuxizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf0d1281-0d06-4c15-aa3a-4cdbe0a6ccb7/lejivupaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fff15f6b-81cd-4af2-a61f-c1cf943a8a93/5243259289.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3771/2806/files/polud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/4302/7613/files/vuzunetokidusapipuwugi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0487/0032/6038/files/authentic_assessment_examples_for_english_language_learners.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6499/0117/files/42465635608.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_off0000820a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x820A 4920 bytes
SHA-256: f88ffa7510fcd6e381d42a489fadd120c1f0e5da26799793944cc1ba2028af92
font_01_sfnt_off000092cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92CF 10376 bytes
SHA-256: adf3e707565edbe50e613c872cb05ba193b4364089e7260f768ad811dd94c848

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