Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43ad7abdf3c54be…

MALICIOUS

PDF

49.1 KB Created: 2020-08-01 10:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0af560a313164c4de85a70173e5f8937 SHA-1: 278e11cb81519ccde6502e7adcf5a70ea630bdee SHA-256: a43ad7abdf3c54bef793e175e9b6fd6c1ab99f2fdf6aac0fa2491f3681078305
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=908+316+8677'. Additionally, it exhibits a PDF link farm behavior, with numerous links to external PDFs, including one hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to contain the malicious URL. The primary attack pattern involves luring the user to a malicious site via the embedded link.

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=908+316+8677
    • http://files.niwotcounseling.org/uploads/1/3/0/7/130775393/matuvagu.pdf
    • http://files.redgatecustoms.com/uploads/1/3/0/8/130813639/92047.pdf
    • http://files.k12voip.com/uploads/1/3/1/3/131380889/rexulotasosuri-dewaxenawapa-bosigovanug-kokapeja.pdf
    • https://cdn.shopify.com/s/files/1/0438/7107/6520/files/65436804649.pdf
    • https://cdn.shopify.com/s/files/1/0440/2751/0934/files/nolafixiwatafo.pdf
    • https://cdn.shopify.com/s/files/1/0435/3854/6840/files/7140496662.pdf
    • https://cdn.shopify.com/s/files/1/0433/6576/1176/files/26929137159.pdf
    • https://cdn.shopify.com/s/files/1/0430/9050/9977/files/1355460460.pdf
    • https://cdn.shopify.com/s/files/1/0428/9495/0556/files/fezoked.pdf
    • https://cdn.shopify.com/s/files/1/0434/4007/9005/files/bebewiredizazikarevajug.pdf
    • https://cdn.shopify.com/s/files/1/0438/2726/5693/files/lasarezevovopapixet.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5825/files/31100019256.pdf
    • https://cdn.shopify.com/s/files/1/0437/7283/8039/files/mowasajazarikenimozud.pdf
    • https://cdn.shopify.com/s/files/1/0430/7383/1072/files/35096008981.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/1/0430/905

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d71.bin
595166baa4058c44a64e9e8fe29c82848eefcf4e17d695e7b22f53b7fb73236b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D71 4336 bytes
font_01_sfnt_off00006c08.bin
5f7ffa5d20b4bead2e49d1343ecf8ccb35f3620e2d9d673199f837c63abd7f4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C08 12108 bytes
font_02_sfnt_off000092ca.bin
bbbb18dae401153910a28f9cf358712136551ffc074ce1b6991d3d0ba4454354		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92CA 16464 bytes
font_03_sfnt_off0000a8e3.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8E3 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.