Malicious PDF — malware analysis report

Static analysis result for SHA-256 3827486f4a9fe1c9…

MALICIOUS

PDF

48.0 KB Created: 2020-08-31 03:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8f848831d3a7afe65587ddb6c8215ec SHA-1: 484ba83916837d4d2a19730c2985c08c9789ff39 SHA-256: 3827486f4a9fe1c99fc638d89aeda0ed12c4e493effb208e4466534cca70180b
150 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/wix?keyword=building+systems+for+interior+designers'. This URL is likely used to direct users to malicious content. The document body, though heavily garbled, contains text fragments that align with the lure. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=building+systems+for+interior+designers
    • https://static.usrfiles.com/ugd/b8c837_080ec4ffa03b4f358c3fdd87102182c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_3b469bc7ffd8453a8526982b3674e4be.pdf
    • https://static.usrfiles.com/ugd/906e9f_1409d8ee62f147a8a6086c9be4fcbfbd.pdf
    • https://static.usrfiles.com/ugd/067ecb_d3d696cee2e84ae790366372830e70cf.pdf
    • https://static.usrfiles.com/ugd/23b571_282e764db5c2481ca2c5140a039c60b8.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa4e1d730bb54bb183730743fb3ae968.pdf
    • https://static.usrfiles.com/ugd/f0f215_7d6686d3d4e04a4ebf690382397f4a17.pdf
    • https://static.usrfiles.com/ugd/b8c837_52637f0ed32840d0a19be67597a8bf2c.pdf
    • https://cdn.shopify.com/s/files/1/0438/4319/0944/files/woxududixupexore.pdf
    • https://cdn.shopify.com/s/files/1/0434/7861/4168/files/suruvozanalewavukog.pdf
    • https://cdn.shopify.com/s/files/1/0431/6410/6901/files/tomisizifa.pdf
    • https://cdn.shopify.com/s/files/1/0430/1144/0803/files/nokaf.pdf
    • https://cdn.shopify.com/s/files/1/0440/0365/5830/files/food_sensory_evaluation.pdf
    • https://cdn.shopify.com/s/files/1/0431/5208/1053/files/41617687197.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_off00006fb9.bin
427f5eefa07e140aadeddecf0c8ed497e8363467733542e0b5bc9794d6afed41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB9 5048 bytes
font_01_sfnt_off000080d6.bin
da1d841e85f6841ac337e7535b03abf563385e3dfb217647fcd517ffa2650df9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80D6 10472 bytes
font_02_sfnt_off0000a4a3.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4A3 4324 bytes

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