Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85e2cce8431ea28…

MALICIOUS

PDF

41.9 KB Created: 2020-08-31 12:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ab400547ddad5ad2455714e1a84d337 SHA-1: 4ebd1fdba3ee46fa59b8aec1385a119fbfcc0172 SHA-256: c85e2cce8431ea28d16d85f046da360cb365d2ddd6a41257fb75544c2a0df9bb
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 critical heuristic firing for a malicious redirector link. It also contains a PDF link farm, indicating a large number of external links. The primary malicious URL identified is ttraff.ru, which likely serves as a redirector to further malicious content. The document body contains garbled text but includes the malicious URL and several other URLs pointing to static.usrfiles.com, which are likely part of the link farm.

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=pixar+short+films+collection+volume
    • https://static.usrfiles.com/ugd/d63aaf_64101fbf38ec47079ebeeaef85420940.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c01422732884498805870ffeabb6661.pdf
    • https://static.usrfiles.com/ugd/9e41f0_bcc50e32bad5460eb662408afdfd3ec9.pdf
    • https://static.usrfiles.com/ugd/2f7815_03ecf507c06246358083a89eb5d729d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e92a1be85ce4516be70ff724960146d.pdf
    • https://cdn.shopify.com/s/files/1/0436/4887/6702/files/95719855605.pdf
    • https://cdn.shopify.com/s/files/1/0428/7417/5644/files/capacitive_touch_sensor.pdf
    • https://cdn.shopify.com/s/files/1/0439/6030/3774/files/nozabidubexufemegu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6836/6746/files/abbreviation_list_of_computer.pdf
    • https://cdn.shopify.com/s/files/1/0432/1869/8400/files/zutan.pdf
    • https://cdn.shopify.com/s/files/1/0434/5197/3799/files/your_lie_in_april_piano_sheet_music.pdf
    • https://static.usrfiles.com/ugd/b8c837_f700d46583144fc38939bec58969a510.pdf
    • https://static.usrfiles.com/ugd/accd1f_23f341ed334c4638adf36c199ff6b0c2.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_97affef44e884be5b0ee5f46ce845371.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_off000065e4.bin
23751edbf6dfceec7c50ba1f555f35ffe21ad2fa95b77a516c5a2dc046e13094		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65E4 5252 bytes
font_01_sfnt_off0000779f.bin
afbe6b3763be13e447a0fd76a1c076d7f4895ae62403acf10345abdbfd55f691		 pdf-font-stream PDF embedded font (sfnt) at offset 0x779F 10288 bytes

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