Malicious PDF — malware analysis report

Static analysis result for SHA-256 7031575616076b73…

MALICIOUS

PDF

43.0 KB Created: 2020-08-29 02:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6be54535529e80e6ae62eb0b957dbf65 SHA-1: 3e077c25503b6510132775d8948bd0e0b067b31b SHA-256: 7031575616076b730d4c9c37829569c4c00837e42f85a7afd46d5597fcb12cc9
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as a free artist portfolio template, which redirects to malicious infrastructure. The ML classifier strongly indicated maliciousness, and the PDF was flagged for linking to known malicious redirectors and for containing a large number of external PDF links, suggesting a link farm. No scripts were extracted, but the presence of embedded URLs and the malicious redirector link are strong indicators of a phishing or scam attempt.

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.ru/wix?keyword=artist+portfolio+template+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/1625/5650/files/warajivusakogozefefepozob.pdf
    • https://cdn.shopify.com/s/files/1/0431/0335/5034/files/8353524493.pdf
    • https://cdn.shopify.com/s/files/1/0433/8250/5628/files/iodine_test_for_carbohydrates_lab_report.pdf
    • https://cdn.shopify.com/s/files/1/0433/4403/5993/files/speedball_calligraphy_book.pdf
    • https://cdn.shopify.com/s/files/1/0427/7764/1116/files/survey_analysis_report_excel.pdf
    • https://cdn.shopify.com/s/files/1/0428/5608/7708/files/sat_biology_subject_test_study_guide.pdf
    • https://static.usrfiles.com/ugd/b8c837_7649132ef5904122b1299c1e52f472a3.pdf
    • https://static.usrfiles.com/ugd/b8c837_796876de88fd40fba1d728efb3eaeb1d.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e9de39f2c0a44a3a03084c24defefd1.pdf
    • https://static.usrfiles.com/ugd/b8c837_286e98460dea49649cd398d76478a1db.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf36f6b73d654dffb9ad9e1c2509dd58.pdf
    • https://static.usrfiles.com/ugd/b8c837_19eb905ce2e84e5c9984de8a8255a2fc.pdf
    • https://static.usrfiles.com/ugd/b8c837_84afb516428d45e69379c618e354cae9.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_off0000621b.bin
dd917ddc748f143418f7798d2c0f88d4a724e9d7c6b1edd92008a5b9f6d34810		 pdf-font-stream PDF embedded font (sfnt) at offset 0x621B 5036 bytes
font_01_sfnt_off00007316.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7316 1800 bytes
font_02_sfnt_off00007ba3.bin
b4fdc883c3366662cff08f25e61a83d2ee940571fe137eb5328a6fe248e1102b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA3 10400 bytes

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