Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98b3c4956b01237…

MALICIOUS

PDF

35.3 KB Created: 2020-08-03 12:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 099d7873e8628882006278133f5c6cd2 SHA-1: f03f32dfe35909dadb75eabceda6bde72fd481ac SHA-256: d98b3c4956b01237551e09f42607c89764da237cc121f80968f293952862a620
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate that the document is designed to host a large number of external links, likely for malicious purposes such as phishing or distributing further malware. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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=burket+oral+medicine+pdf+free
    • http://files.benwjohnson.com/uploads/1/3/0/8/130814682/dasabufetosadu_wufobexifilosa_pafemujido_melozutez.pdf
    • http://files.hendrygeosciences.com/uploads/1/3/0/7/130740433/8639297.pdf
    • http://files.indiangrovechurch.com/uploads/1/3/0/8/130814070/677fdfb777.pdf
    • http://files.positivelypinckney.com/uploads/1/3/0/7/130738803/waxitiwufumilamot.pdf
    • http://files.epmclarity.com/uploads/1/3/1/3/131398362/zakorodonis.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kewosa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97253363073.pdf
    • https://cdn.shopify.com/s/files/1/0431/8108/0738/files/vuxogokil.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/notuda.pdf
    • https://cdn.shopify.com/s/files/1/0431/1980/4567/files/osrs_1-_99_construction.pdf
    • https://cdn.shopify.com/s/files/1/0427/4126/8647/files/sakusokezaxarusas.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7064/files/sudako.pdf
    • https://cdn.shopify.com/s/files/1/0436/5906/7550/files/46082095176.pdf
    • https://cdn.shopify.com/s/files/1/0437/2099/9064/files/61233824685.pdf
    • https://cdn.shopify.com/s/files/1/0430/3765/5193/files/masigomumojuzodufipam.pdf
    • https://cdn.shopify.com/s/files/1/0431/7849/2062/files/wilamu.pdf
    • https://cdn.shopify.com/s/files/1/0439/9906/8310/files/gigijifomobatatixisetam.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0077/files/5621510279.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c3a.bin
391937a15eba6c89f4c1ef31fc651314a92de846fc39401e37b890280765eb63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C3A 5236 bytes
font_01_sfnt_off00005dfc.bin
9127a9e5db92a189ab3a0a6e19cc8866357fc084cc9c1adf9d9f5e42df101b17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DFC 10212 bytes

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