Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc26b32295bc963…

MALICIOUS

PDF

40.1 KB Created: 2020-08-12 23:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0806c12c32be260bfda20ca57f13b22c SHA-1: 08971e5476b7fa813a5e8dfd7694938dce3c8e51 SHA-256: 8bc26b32295bc96320190d1ac6427595e63b15a33a6ec9bc637508680ea82652
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to lure users to malicious sites. The primary attack pattern involves redirecting users to potentially 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://ttraff.com/wb?keyword=mixed%20perfect%20tenses%20exercises%20pdf
    • http://files.faithmortimerauthor.com/uploads/1/3/1/4/131406173/b550d50f380e6.pdf
    • http://files.juliakellerbassist.com/uploads/1/3/0/7/130775346/4436980.pdf
    • http://files.pickledpretty.com/uploads/1/3/0/7/130775413/dosajatekedofo_jileko_vopamodo_zepisasoso.pdf
    • https://cdn.shopify.com/s/files/1/0434/6268/8918/files/arduino_mega_2560_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/5987/9841/files/gazijazuvepexex.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4967/files/fotokafojerir.pdf
    • https://cdn.shopify.com/s/files/1/0435/8039/1585/files/72878181516.pdf
    • https://cdn.shopify.com/s/files/1/0433/4387/2150/files/96734609667.pdf
    • https://cdn.shopify.com/s/files/1/0431/2917/6232/files/79667834619.pdf
    • https://cdn.shopify.com/s/files/1/0438/9991/2344/files/xorizopetomuzoxi.pdf
    • https://cdn.shopify.com/s/files/1/0435/7629/5592/files/nukosotevifolovalevalujo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3349/3655/files/79704879837.pdf
    • https://cdn.shopify.com/s/files/1/0428/5782/4415/files/ascomycota_characteristics.pdf
    • https://cdn.shopify.com/s/files/1/0432/9986/4734/files/sepokejuwofe.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1786/files/mathematics_for_seismic_data_processing_and_interpretation.pdf
    • https://cdn.shopify.com/s/files/1/0428/7057/1174/files/4_personality_types.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000052d8.bin
b5814698e318d13f7f3a97280842dfc767d0eb0b6891c64729413e7eeb4bffd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52D8 4660 bytes
font_01_sfnt_off000062c1.bin
d139e520337e5a0916ad89dd6e3cf0f2c5fb619948ba6401d4ed1aae7bfa1a8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62C1 10068 bytes
font_02_sfnt_off0000852c.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x852C 4324 bytes

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