Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13ef52a5b808585…

MALICIOUS

PDF

48.5 KB Created: 2020-08-10 11:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34f74baff90fcc57d9ef00061da3878c SHA-1: 81ff47d324fa3b169c32902f8114b1f34e465d6e SHA-256: a13ef52a5b80858578b4b3fcf74d996c710e4f4091eb8b3d7557f226472cd8d6
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating a phishing or malicious content delivery attempt. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL that is also flagged by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic.

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/pify?keyword=drawing+geometric+solids+pdf
    • http://files.westlinnalcohol.com/uploads/1/3/1/6/131606331/nimofizopora-fepixi.pdf
    • http://files.joelmiddleton.com/uploads/1/3/1/3/131379830/35237.pdf
    • http://files.speckmath.net/uploads/1/3/1/4/131437666/daxomixolosotenon.pdf
    • http://files.heatherdawnbatchelor.com/uploads/1/3/0/9/130969917/kogulo_vorokivujala_sedexojozuru.pdf
    • http://files.speckmath.net/uploads/1/3/1/4/131437666/daxomixolosotenon.p
    • https://cdn.shopify.com/s/files/1/0431/3497/6149/files/acs_general_chemistry_practice_exam.pdf
    • https://cdn.shopify.com/s/files/1/0439/0407/3880/files/ralowe.pdf
    • https://cdn.shopify.com/s/files/1/0437/7644/2530/files/17000464302.pdf
    • https://cdn.shopify.com/s/files/1/0433/1818/2041/files/autocad_border_printing.pdf
    • https://cdn.shopify.com/s/files/1/0431/6620/4066/files/nolevedefutu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2629/files/xijovaletikedujogasuza.pdf
    • https://cdn.shopify.com/s/files/1/0433/5045/8520/files/11425452155.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/doragewotupepefe.pdf
    • https://cdn.shopify.com/s/files/1/0428/0310/1863/files/mutagidoxu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9183/6566/files/alcohol_metabolismo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0301/0468/files/lagalizurovurotatakerat.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jonexosorovofevovu.pdf
    • https://cdn.shopify.com/s/files/1/0428/0349/5071/files/adjective_kinds_and_examples.pdf
    • https://cdn.shopify.com/s/files/1/0431/2681/6932/files/vapevuzip.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_off000070d5.bin
c61d7b814983de10b03d9e0d8b50aa5eeadd50ff37ffeaeb10ef77e49d1a9816		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70D5 5352 bytes
font_01_sfnt_off000082fc.bin
0df3a0b047010440fd806bcc50fe115f942a7e0c6152d84f72a01bd09c0d6816		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82FC 10128 bytes
font_02_sfnt_off0000a58b.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA58B 4324 bytes

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