Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f4b99d100bb9026…

MALICIOUS

PDF

51.0 KB Created: 2020-08-22 05:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 538b9ced30643ca3c435dd73e42b87fb SHA-1: a9c7ea7e1932bfc8f23da1d8c385881232578a86 SHA-256: 4f4b99d100bb902604233a4a5b2329d7f8946319eb9a2b6a02463479d958fbaf
120 Risk Score

Malware Insights

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

The PDF file contains a lure related to diabetes treatment, but the primary malicious functionality is driven by embedded links. One critical heuristic indicates the PDF links to a known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=guidelines+for+treating+diabetes+mellitus'. Another heuristic identified a PDF link farm, with the first URL pointing to 'https://cdn.shopify.com/s/files/1/0433/8886/2622/files/sumipuvunilurezetoxiduxot.pdf'. The document body is heavily obfuscated but contains the redirector URL.

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.cc/pify?keyword=guidelines+for+treating+diabetes+mellitus
    • http://files.surelockedin.com/uploads/1/3/1/8/131856844/b1bb7f4c4a.pdf
    • https://cdn.shopify.com/s/files/1/0433/8886/2622/files/sumipuvunilurezetoxiduxot.pdf
    • https://cdn.shopify.com/s/files/1/0436/9865/1288/files/52030233957.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xodowowesibaxen.pdf
    • https://cdn.shopify.com/s/files/1/0429/1300/5724/files/anticancer_drugs_mcqs.pdf
    • https://cdn.shopify.com/s/files/1/0434/4869/6993/files/nintendo_ds_emulator_mac.pdf
    • https://cdn.shopify.com/s/files/1/0463/0439/5426/files/lujodaginagipidijapeso.pdf
    • https://cdn.shopify.com/s/files/1/0430/9280/3744/files/asvab_arithmetic_reasoning_practice.pdf
    • https://cdn.shopify.com/s/files/1/0434/0701/6103/files/chupulu_kalasina_subhavela_serial_song.pdf
    • https://cdn.shopify.com/s/files/1/0427/5005/0460/files/roadmaster_mountain_bike.pdf
    • https://cdn.shopify.com/s/files/1/0429/1330/0647/files/algebra_textbook_online.pdf
    • https://cdn.shopify.com/s/files/1/0435/7816/3363/files/does_anybody_have_a_map_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0436/1512/5662/files/90480495973.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_off000086df.bin
48936a7a1ca9cbe6e10bf704272cd1abb115a60d24a2fcefe829adb9a1265ca9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86DF 5396 bytes
font_01_sfnt_off00009918.bin
fd8c2354f8aafc3cb42a234b49a270aa6a2e6e77b1797a297ae298feb93f2e54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9918 11716 bytes

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