Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bce8317e64afe48…

MALICIOUS

PDF

39.4 KB Created: 2020-10-12 00:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 497228bc8887a3d54441ed2d214afeca SHA-1: fffe5dd68102ace215002c69856dafe4d90a9b92 SHA-256: 2bce8317e64afe48192ba15cf35c878b167ea3b75d1b67c74222edfe5f2dab7f
114 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a worksheet title, aiming to trick users into visiting a potentially harmful site. The ML classifier strongly indicated maliciousness, and the malformed stream length heuristic further supports exploit activity. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.link/pify?keyword=mixed+ionic+and+covalent+naming+worksheet+answers In 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/4ba19975-9d19-424d-bcff-bfe7b1915770/digukutifefevetelujirago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45e77ec9-0c77-4dff-ad8c-2000a85b9856/61712722448.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17a01242-e99d-4f53-86ac-064a7852e940/39293917817.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/529e4287-bab9-4c4a-80fd-d1292c53ff11/3214830986.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a730c685-f736-46c2-9ad6-209c4aef4b4d/jiroru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5148b07d-9499-4a37-85e4-7e8cd19a8262/45401271642.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d14f0330-2feb-40ea-aa55-0d6dbf984c4f/2722343467.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6113/2962/files/1609532079.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7749/2118/files/80952301541.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5557/3909/files/vepopipe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1501/5080/files/mebeduruvesu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8771/4721/files/vawuvonedevexaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/4424/7973/files/step_up_2_song_in_the_rain.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/8276/0601/files/solar_system_art_projects_for_5th_grade.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_off00005a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A15 5640 bytes
SHA-256: 1edd789c97cf6268667862b2b1c35c42e786db7048c5e914844d85464b0ed969
font_01_sfnt_off00006d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D3C 10272 bytes
SHA-256: f86d0c9021301e6c01814c3fe478696342dba6d9feaf3da428bc7672329894a5

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