Malicious PDF — malware analysis report

Static analysis result for SHA-256 d558b01e4603cd31…

MALICIOUS

PDF

61.5 KB Created: 2020-09-01 21:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 476070a9d9c4e1bfa1f507b6155f9bb2 SHA-1: b8dbb0e60145636cd8aa4ffe6c562d010d7c2b51 SHA-256: d558b01e4603cd316ff1a0809ce908f12017f8103cd65f4c40acae6b082c44aa
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious due to a high density of embedded links, characteristic of a link farm or redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flagged the URL https://ttraff.ru/wix?keyword=uiview+transform+autolayout as pointing to known malicious infrastructure. The PDF_SEO_LINK_FARM heuristic further indicates a large number of external PDF links, with https://static.usrfiles.com/ugd/7ff653_98c1f50368d149798f144909a7b408ac.pdf being the first identified in this farm. The document body itself contains garbled text and the flagged URLs, suggesting it is not intended for legitimate user consumption but rather as a vehicle for link distribution.

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=uiview+transform+autolayout
    • https://static.usrfiles.com/ugd/7ff653_98c1f50368d149798f144909a7b408ac.pdf
    • https://static.usrfiles.com/ugd/1c8c6c_b3702a51349e4093bc39b34d18ee8ade.pdf
    • https://static.usrfiles.com/ugd/a48928_b4004372462f41a5b8c0441c92aab11e.pdf
    • https://cdn.shopify.com/s/files/1/0466/8008/0549/files/vafotegodoweviwetali.pdf
    • https://cdn.shopify.com/s/files/1/0437/3073/1173/files/tabela_peso_de_chapas_de_ao.pdf
    • https://cdn.shopify.com/s/files/1/0431/1000/6940/files/logesetukafefa.pdf
    • https://cdn.shopify.com/s/files/1/0432/0411/6637/files/39678948836.pdf
    • https://cdn.shopify.com/s/files/1/0440/9825/7048/files/66352077487.pdf
    • https://cdn.shopify.com/s/files/1/0431/1239/9010/files/xajebibodarewezobugejoxe.pdf
    • https://cdn.shopify.com/s/files/1/0453/4127/8363/files/fisco_agenda_2020_online.pdf
    • https://cdn.shopify.com/s/files/1/0428/5769/3347/files/binogesedudogomiru.pdf
    • https://cdn.shopify.com/s/files/1/0428/8957/6614/files/tuxutafoketakojedo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1402/8444/files/34437977316.pdf
    • https://static.usrfiles.com/ugd/b8c837_23bbc3f41b1c4d88aa8a33f05ba5bcb1.pdf
    • https://static.usrfiles.com/ugd/b8c837_f1b405fb8ba84b7eadd8756f7b612aad.pdf
    • https://static.usrfiles.com/ugd/93971e_219896c218a842d18675cf3984ec32d8.pdf
    • https://static.usrfiles.com/ugd/353d00_c5eb67b51afd400f9751137af11aa152.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069f2.bin
d94bccb1a42f90ef809e7dc5f982003617cc722a45140f57dd5d4dee2c8633f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69F2 12084 bytes
font_01_sfnt_off00009176.bin
eb1fe78e7c3b21a960d84f6bdf51efc8e60a1b4adf6cdb99653d884a107bd9c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9176 5156 bytes
font_02_sfnt_off0000a307.bin
7819d350c56882ce8358892a22db4095f736ecdb7a36ffed64fb34af6644128f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA307 15832 bytes
font_03_sfnt_off0000d3f4.bin
9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F4 16036 bytes

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