Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61306405bc1b2fc…

MALICIOUS

PDF

49.4 KB Created: 2020-10-30 21:58:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d3a2d777120774415727ced009790b59 SHA-1: e3852a6a45c129423dfdbbfe9af188c3c714b609 SHA-256: b61306405bc1b2fc4e8ce9cc5bba68dc119eb2e889e329a86393dee5ad8262f9
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a link to a known malicious redirector, gettraff.ru, which is disguised with a keyword related to anime. The document also exhibits characteristics of a link farm, embedding numerous other PDF links, some of which are also hosted on S3 buckets. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL confirms the intent to lead users to harmful content.

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/aws?keyword=the+highschool+life+of+a+fudanshi+episode+1+eng+sub In PDF document text
    • https://farukipem.weebly.com/uploads/1/3/4/4/134473356/paguxig.pdfIn PDF document text
    • https://mesifadenox.weebly.com/uploads/1/3/4/1/134108947/4842529.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nademopor/critical_thinking_in_nursing.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9238/6999/files/90107914736.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/6634848264.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/4461/7371/files/how_to_upgrade_android_tv_box_firmware.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/764fafa7-3658-4b4c-b72e-e24792c95c0b/kutasose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45f9413d-ce56-4870-82aa-53a8c29e5e03/wowijeki.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/a_level_chemistry_past_papers.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/michigan_association_of_school_nurses.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00008b57.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8B57 25724 bytes
SHA-256: 3bbe778de3b197bdd27254a5cfc9b77256028e65efdc0b417a39e9554b10363e
font_00_sfnt_off0000509c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x509C 5460 bytes
SHA-256: af6894a0ab1bf8f0f00fc41407cb8a8f459a78841f6f75543be05c0611797cea
font_01_sfnt_off00006334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6334 11700 bytes
SHA-256: 0c283e346f2125ca268bb616ead075283cb4887db1e049da71568a176266e6e1

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