Malicious PDF — malware analysis report

Static analysis result for SHA-256 b414cb50b0400ef8…

MALICIOUS

PDF

43.6 KB Created: 2020-09-05 15:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e4f4d4ea88f2527074c34ce0c2954ac4 SHA-1: 366077c2aa86f16ea6c8f039ee757f5d7583cf77 SHA-256: b414cb50b0400ef82c673562a911c95ae1371136362e43e5402882a759d3d791
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link disguised as an application letter, which redirects to known malicious infrastructure. The document also features a large number of external links, many of which point to PDF files, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness.

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.link/wix?keyword=application+letter+as+a+teacher+format In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/a382ee_aaf0a19cfa844c949465247984336b7a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c20ea7_c5f16896dec2483b850678f009c70d58.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/5fd5c1_0d4b0a8f570a4be7943d5124249c46ca.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_1df06a60e2a0448bb8c8dd8cb523d366.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/63022f_18733442e73c4cb0898ff18c62504ff4.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/32acb1_dcb42a3c52df4d3d8ee9a49995f51e3f.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6482/6773/files/conforme_letter_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4731/2789/files/apocrifos_del_antiguo_testamento_tomo_1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9454/0452/files/jevaxabematazabusekuta.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7365/0334/files/10452662475.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2323/5234/files/pathophysiology_of_pregnancy_induced_hypertension.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0058/5632/files/sefimuzi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1184/9890/files/jelazonowozalorajisux.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61EE 2828 bytes
SHA-256: 85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f
font_01_sfnt_off00006be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BE8 5244 bytes
SHA-256: 8fc0dab2cf12f0af26c5806db42c7fa8acff495ff9af53b4fdac1fdb987ff3a4
font_02_sfnt_off00007d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D92 9792 bytes
SHA-256: 2c5ea45dadfe2b0384b1976b9a9f104d461fb7a3c728009d1eed3fd584414c5c

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