Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e7cf90116122a1…

MALICIOUS

PDF

35.8 KB Created: 2020-09-19 12:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17f13f05fe2ccaf2f41679e159694b61 SHA-1: 5b6b286db0c31605ee5fa96c0e29283e31319da3 SHA-256: c3e7cf90116122a1c07e1c7aa322a191ef499e976d726a2fc566bafeb75e1c8f
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with critical heuristics identifying it as a malicious redirector and a link farm. The primary URL, https://ttraff.me/wix?keyword=texas+a%2526m+university+%25E6%258E%2592%25E5%2590%258D, is flagged as a malicious redirector. Additionally, a large number of links point to external PDF files hosted on various domains, suggesting a coordinated effort to distribute content or manipulate search engine results. The ML classifier strongly supports the malicious nature of this PDF.

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.me/wix?keyword=texas+a%2526m+university+%25E6%258E%2592%25E5%2590%258D
    • http://fusok.petejean.com/uploads/1/3/1/6/131636951/8059675.pdf
    • http://tafaroto.thepaintbarpaintings.com/uploads/1/3/2/6/132696558/rafavemuvisilaxaduv.pdf
    • http://files.aestern.org/uploads/1/3/0/8/130874474/sidoful-gosoxabozi-romomamelo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0607/4780/files/84905589981.pdf
    • https://cdn.shopify.com/s/files/1/0445/3682/3972/files/zewopurogotadavuzuliwizuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/0489/5143/files/aieee_2019_online_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0435/7164/2527/files/bullet_journal_template_goodnotes.pdf
    • https://cdn.shopify.com/s/files/1/0433/4524/8421/files/passing_authorization_header_in_resttemplate.pdf
    • https://7dceed6f-e97c-4f4d-b49a-1e9494b131e3.filesusr.com/ugd/dba42a_72d57e31ce974e5884056b67e63357b3.pdf?index=true
    • https://50a3b0da-94e7-47e0-8efe-be6a5fa9d731.filesusr.com/ugd/501a20_142984abb4e5455eb5dee3842f5364a2.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0429/9672/7957/files/fivakoxabavidupazosewuv.pdf
    • https://cdn.shopify.com/s/files/1/0437/5566/7605/files/27890531873.pdf
    • https://cdn.shopify.com/s/files/1/0437/5986/1912/files/58640296801.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/34530012154.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005006.bin
7bd1c7058c5171756eb70f2af4c60e653aafdbefcfe6976f307b5c818bd7410e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5006 4568 bytes
font_01_sfnt_off00005fa3.bin
4bc679c020ee02452b8afc18f5220dc5649aeb93a872d5ddb6a380b2377554d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA3 10256 bytes

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