Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad050f8051ca6d2…

MALICIOUS

PDF

43.0 KB Created: 2020-08-03 16:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dee7a2405e14ca219a39b8ff73105022 SHA-1: e7481a62e6f1a599d01e983069194c716e4328e5 SHA-256: 4ad050f8051ca6d20e188d621e4bb5c36310a2d22ce46128dff8571518f43048
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, indicating a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.ru/pify?keyword=undercover+economist+pdf. The ML classifier also strongly flagged this PDF as malicious. The document body contains obfuscated text and URLs, suggesting an attempt to disguise malicious content.

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=undercover+economist+pdf
    • http://files.amyruthallen.com/uploads/1/3/1/8/131871488/jubugi.pdf
    • http://files.shamushaws.com/uploads/1/3/2/6/132681201/tezejif.pdf
    • http://files.pterodactylaerospace.com/uploads/1/3/0/7/130740522/0249bccf3e2f9.pdf
    • http://files.drmichaelgimbel.com/uploads/1/3/1/0/131069789/rovufu.pdf
    • http://files.lordbassenterprise.com/uploads/1/3/1/4/131482950/6d53b08.pdf
    • https://cdn.shopify.com/s/files/1/0437/9066/3832/files/11567315285.pdf
    • https://cdn.shopify.com/s/files/1/0429/8529/1937/files/pitexoje.pdf
    • https://cdn.shopify.com/s/files/1/0438/4574/6838/files/kamoxezem.pdf
    • https://cdn.shopify.com/s/files/1/0428/1751/9772/files/jisotarodafigofu.pdf
    • https://cdn.shopify.com/s/files/1/0440/5392/1957/files/fikujisiwozozu.pdf
    • https://cdn.shopify.com/s/files/1/0440/1948/2774/files/xarujosigumidavupos.pdf
    • https://cdn.shopify.com/s/files/1/0438/0708/0605/files/45742029091.pdf
    • https://cdn.shopify.com/s/files/1/0437/5229/2513/files/zipapidunikosabun.pdf
    • https://cdn.shopify.com/s/files/1/0438/0937/4368/files/ffxiv_the_pool_of_tribute.pdf
    • https://cdn.shopify.com/s/files/1/0434/3077/2901/files/silexewo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0703/9895/files/jotekoxasirutofufi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4030/9402/files/4352949954.pdf
    • https://cdn.shopify.com/s/files/1/0428/4016/2470/files/zomezosimigokurinox.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_off00006afc.bin
71d2b09f74bb7cba450b8d9fed8000835280d3b9750933c49d3efa539490ce68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AFC 5112 bytes
font_01_sfnt_off00007c59.bin
e7b03082697a0a008d45567f96c2ee9790b647ba2fb6eeab15d8174ed705e88f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C59 10296 bytes

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