Malicious PDF — malware analysis report

Static analysis result for SHA-256 8feebba097112088…

MALICIOUS

PDF

43.8 KB Created: 2020-08-02 09:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 103f61b9b3f1ea85d832bd30742a5d7e SHA-1: dd4a7efe9abbf0a8ec9725152b8458f5d79b082f SHA-256: 8feebba0971120883032b20a3375f1886a822eeab09bc1c6c2e6956144caa2ec
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector at 'https://ttraff.ru/pify?keyword=virtualbox+windows+98'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains this URL, suggesting the primary purpose is to lure the user to a malicious site. No scripts were extracted, limiting the analysis of further payload delivery mechanisms.

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=virtualbox+windows+98
    • http://files.amussispainting.com/uploads/1/3/0/7/130740148/c4c9371e.pdf
    • http://files.hiltonheadbtar122.com/uploads/1/3/1/3/131380251/8287326.pdf
    • http://files.empirepanj.com/uploads/1/3/0/7/130775831/6678807.pdf
    • http://files.greateventsrecording.com/uploads/1/3/1/4/131408465/finife.pdf
    • https://cdn.shopify.com/s/files/1/0429/7405/2503/files/tipotepamivususi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4890/2557/files/htp_221h_tig_welder.pdf
    • https://cdn.shopify.com/s/files/1/0431/7102/0960/files/61347820171.pdf
    • https://cdn.shopify.com/s/files/1/0431/6961/1932/files/19800011304.pdf
    • https://cdn.shopify.com/s/files/1/0431/0374/8260/files/fovugol.pdf
    • https://cdn.shopify.com/s/files/1/0431/7885/2507/files/69384103111.pdf
    • https://cdn.shopify.com/s/files/1/0441/1038/1208/files/mercenaries_ps2_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0431/5945/3845/files/home_folder_mac.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nejoxalivivurotuzepebibus.pdf
    • https://cdn.shopify.com/s/files/1/0430/6554/0759/files/sinisumetipoxelade.pdf
    • https://cdn.shopify.com/s/files/1/0431/6938/2557/files/sevuwezifajareduwitutute.pdf
    • https://cdn.shopify.com/s/files/1/0435/7337/9231/files/josodomajizik.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_off000060ef.bin
15b1550c99398750763facd58ec1c9ee261a427f1d91f36e61ea74517412d1f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60EF 3512 bytes
font_01_sfnt_off00006d87.bin
eaa7eef077ca380578b3de7d7101ec167a6f42165c89e6b37def7d86844a99dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D87 5436 bytes
font_02_sfnt_off0000801a.bin
a5e1303cf3dcbfdfcaff31be5124be9d31f525a3a8cd1beb4d1cfb5bb2de5118		 pdf-font-stream PDF embedded font (sfnt) at offset 0x801A 9888 bytes

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