Malicious PDF — malware analysis report

Static analysis result for SHA-256 382ac6a416efdea8…

MALICIOUS

PDF

43.8 KB Created: 2020-08-07 01:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e524b7481c1c88e47d0e6ae16bdc8ffd SHA-1: 7f321c8c2cf2c72c35e05c0a330d279055b2ba8c SHA-256: 382ac6a416efdea8f39191b18fd9677445fcc20dc01647c155743e4ec06d53da
154 Risk Score

Malware Insights

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

The PDF document contains a malicious redirector link disguised as a resource for "frozen shoulder stretching exercises". The ML classifier strongly indicates maliciousness, and the PDF is flagged for linking to known malicious infrastructure. The document body, though heavily obfuscated, contains the URL that leads to the malicious redirector.

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=frozen+shoulder+stretching+exercises+pdf
    • http://files.loganfootball.com/uploads/1/3/1/3/131398591/xugoz.pdf
    • http://files.yackamoorundielandcaregroup.com/uploads/1/3/0/7/130740174/194149.pdf
    • http://files.greenriverbbc.com/uploads/1/3/1/4/131455543/2cd97b5cae69.pdf
    • http://files.buddhameditationdc.org/uploads/1/3/1/4/131453861/7602151.pdf
    • http://files.buildsmartgroup.com/uploads/1/3/0/9/130969562/95afbd7f2.pdf
    • https://cdn.shopify.com/s/files/1/0437/4937/6149/files/square_root_alt_code.pdf
    • https://cdn.shopify.com/s/files/1/0436/3629/3785/files/can_you_send_videos_on_discord.pdf
    • https://cdn.shopify.com/s/files/1/0429/6579/4965/files/10282225155.pdf
    • https://cdn.shopify.com/s/files/1/0437/3594/1285/files/89294950353.pdf
    • https://cdn.shopify.com/s/files/1/0436/4910/6073/files/active_release_technique.pdf
    • https://cdn.shopify.com/s/files/1/0435/4359/3109/files/52345832494.pdf
    • https://cdn.shopify.com/s/files/1/0432/1778/0896/files/vevugutevanunovoputirak.pdf
    • https://cdn.shopify.com/s/files/1/0439/3975/8235/files/zonelowuru.pdf
    • https://cdn.shopify.com/s/files/1/0433/1143/1838/files/1530878213.pdf
    • https://cdn.shopify.com/s/files/1/0437/5665/0645/files/91320728691.pdf
    • https://cdn.shopify.com/s/files/1/0431/8186/7176/files/vifimekiforedoxagojoxud.pdf
    • https://cdn.shopify.com/s/files/1/0433/0638/5573/files/kemudim.pdf
    • https://cdn.shopify.com/s/files/1/0434/5466/0758/files/pidasivamoginevadi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9900/4827/files/magupuwonugaj.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/
    • https://cdn.shopify.com/s/files/1/0437/3594/1285/files/892949

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c72.bin
48c4742ea8f62548185a4b5b54ec90e52678963d6ec424a161e7f106c59cdd9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C72 5280 bytes
font_01_sfnt_off00007e77.bin
b704ce09594fe06f9184b96347a2df9c28aee3f9904d39352a4fbaddc4c10d44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E77 10296 bytes

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