Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ab26ad3b0fa037…

MALICIOUS

PDF

55.2 KB Created: 2020-09-02 00:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c4f64812908ca324eeb78c3e56d85bd SHA-1: 75b8881f0b64806f4ac846df6fc773733c55d38d SHA-256: 66ab26ad3b0fa037615212b05902fb75f7f75657e09bc16afe0dd528ee00dfaf
162 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to known malicious redirector infrastructure. The document body text and heuristic firings suggest a lure related to financial reports, likely intended to trick the user into clicking the malicious link. No scripts were extracted, but the presence of embedded links and the invoice lure indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/wix?keyword=quickbooks+ar+aging+report+by+invoice+date
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0118/4417/files/49737393613.pdf
    • https://cdn.shopify.com/s/files/1/0430/7383/1072/files/appsc_group_2_previous_papers_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5456/3477/files/88616401514.pdf
    • https://cdn.shopify.com/s/files/1/0437/4904/8474/files/wind_erosion_and_deposition_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/6430/3522/files/bomazixikes.pdf
    • https://cdn.shopify.com/s/files/1/0432/6991/4782/files/ielts_general_speaking_samples_band_9.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/wupetunoworo.pdf
    • https://cdn.shopify.com/s/files/1/0440/3278/6597/files/briggs_and_straton_engine_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/3365/6476/files/avancemos_2_textbook_answers.pdf
    • https://static.usrfiles.com/ugd/238140_9a09cc80ef7d41c984c18679d44a0959.pdf
    • https://static.usrfiles.com/ugd/1fa6dd_19a8f6e4421342a891be9b774b54ccd2.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f4278d71d22471597b283dbeea6eddd.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008f03.bin
6cfc60001da7250d9179995abb2a9084359e9bf4e1732e6118cbe8f1658e11d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F03 5636 bytes
font_01_sfnt_off0000a240.bin
7f38c7bd3076d5ec567b373f8788658f617417f44aeaffad1c2d563936ecbb0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA240 2268 bytes
font_02_sfnt_off0000ac50.bin
e1ac4e70297d4f84bf82daa86d5cf769266edf8456c354d06a33ca6fabeda3d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC50 10436 bytes

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