Malicious PDF — malware analysis report

Static analysis result for SHA-256 408483ac7dc84849…

MALICIOUS

PDF

33.6 KB Created: 2020-08-11 08:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01882a05083e7602e48944a99509208b SHA-1: 309ca78a5f41331cf2126e6561c19794c9d62341 SHA-256: 408483ac7dc84849e42ffcf46affd545a65ba45a73d9248a045e8e4f22ee613d
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which are designed to appear as legitimate document titles or resources. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is used to obscure the final destination. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains text related to accounting and a URL that appears to be part of the redirection chain.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=akuntansi+biaya+carter+edisi+14+pdf
    • http://files.baylanders.org/uploads/1/3/1/4/131409909/kodupodiworaf_pafobipebowe.pdf
    • http://nuniba.oakcreekcounseling.org/uploads/1/3/0/7/130776106/97cd007.pdf
    • http://files.businesses4us.com/uploads/1/3/0/7/130739779/59306caa.pdf
    • https://klcfiles.kemenkeu.go.id/2020/04/KLC-Bahas-Soal-Cost-Acc-P8-1.mp4
    • https://cdn.shopify.com/s/files/1/0433/3161/6923/files/american_pie_sheet_music_piano.pdf
    • https://cdn.shopify.com/s/files/1/0437/2725/7749/files/degowebide.pdf
    • https://cdn.shopify.com/s/files/1/0435/9448/1821/files/19291205185.pdf
    • https://cdn.shopify.com/s/files/1/0431/5286/7494/files/vanelokawepe.pdf
    • https://cdn.shopify.com/s/files/1/0431/4556/0226/files/zosovuladuvudiwav.pdf
    • https://cdn.shopify.com/s/files/1/0438/4233/8981/files/gonudasetabafepol.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3475/files/74674571543.pdf
    • https://cdn.shopify.com/s/files/1/0438/3136/1686/files/fruity_loops_studio_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0431/5624/2589/files/android_studio_tutorial_2020_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/5727/4270/files/49270397974.pdf
    • https://cdn.shopify.com/s/files/1/0433/8964/9054/files/91145612015.pdf
    • https://cdn.shopify.com/s/files/1/0432/1270/1854/files/xiben.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_off00004536.bin
af3c0e32c8a40518b9f2220a86042c4a174e66712000541cec41f071efa5bf5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4536 5552 bytes
font_01_sfnt_off0000582d.bin
1c4be7df66a0edd917c7e7f25d4d3044507edb96e79d7fcf0d472e941e2cf681		 pdf-font-stream PDF embedded font (sfnt) at offset 0x582D 9732 bytes

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