Malicious PDF — malware analysis report

Static analysis result for SHA-256 519996eeb1d118b6…

MALICIOUS

PDF

40.3 KB Created: 2020-08-31 07:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9bd3e551d39e081670deb9198753be1a SHA-1: c7c1f232a0c191313a4514d1ce0d849228c1e22f SHA-256: 519996eeb1d118b63d5fbefeabfbcea79261f247b733e19505fe77636d78f3e2
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=reading+comprehension+with+answer+ke'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The document body, though heavily obfuscated, contains the same malicious redirector URL and a benign-looking PDF link, suggesting a lure to external content. The primary intent appears to be redirecting users to malicious infrastructure.

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=reading+comprehension+with+answer+ke
    • https://cdn.shopify.com/s/files/1/0437/5642/1278/files/95617130654.pdf
    • https://cdn.shopify.com/s/files/1/0433/9436/7644/files/21948169431.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tugogesobiwem.pdf
    • https://cdn.shopify.com/s/files/1/0434/1104/6561/files/printed_leatherette_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0432/4252/0739/files/91067646675.pdf
    • https://static.usrfiles.com/ugd/b8c837_f1c45884a71143b18055d956689e6f83.pdf
    • https://static.usrfiles.com/ugd/b8c837_9d88e6aefc154d86af4391af79b3df07.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e9cc5ab94c448da854a1bd4eeb2081d.pdf
    • https://cdn.shopify.com/s/files/1/0454/6491/2024/files/imperial_march_trumpet_sheet_music_easy.pdf
    • https://cdn.shopify.com/s/files/1/0434/0298/5622/files/sound_of_silence_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/2014_jeep_cherokee_manual.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_off00005e68.bin
32572d341ca0b13982abc80f8ba78ad73aef3e52f6760eca7c29c768a94b5b59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E68 5616 bytes
font_01_sfnt_off00007166.bin
777352a8305bfe6c939d6bd4ae1331bcd3e812add1c58ff981c184bea5386294		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7166 10368 bytes

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