Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3559a8c21d5dcd…

MALICIOUS

PDF

45.4 KB Created: 2020-08-30 09:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 841d284b3cb1e9de523690e01e468bb7 SHA-1: 99deb9141fb7c30db24f0e265bcce56d9ff97a60 SHA-256: ad3559a8c21d5dcdc97e2506b0a87545f46815fb80ea6e4ac7cf1e8f07a8c52a
120 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, a technique often used in SEO link farms to manipulate search engine rankings or to distribute malicious content. One of the embedded URLs, 'https://ttraff.com/wix?keyword=conte+els+bons+amics', is flagged as a known malicious redirector. The document body itself is heavily obfuscated and appears to contain metadata related to its generation by wkhtmltopdf, but the primary malicious intent is derived from the link farm heuristic.

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.com/wix?keyword=conte+els+bons+amics
    • https://static.usrfiles.com/ugd/b8c837_c2509a62e6f04c63bb67e3b7fb348064.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a77a55746e24292843f874fb08621f7.pdf
    • https://static.usrfiles.com/ugd/067ecb_bdbd1a64d0d04db3a2ba5df253087d99.pdf
    • https://static.usrfiles.com/ugd/b8c837_b80a51276c4640d8b781c73719c34f29.pdf
    • https://static.usrfiles.com/ugd/5b9a87_add1d0a8735a4b6e9d3e18c16457268f.pdf
    • https://static.usrfiles.com/ugd/b8c837_809268f63d4f4e25bc8ca7711807b741.pdf
    • https://static.usrfiles.com/ugd/b8c837_afbed24747424c868d89aeb25c9ee842.pdf
    • https://static.usrfiles.com/ugd/8e1900_8436c0b76bc64959a26261aebaf3350a.pdf
    • https://cdn.shopify.com/s/files/1/0440/3891/4213/files/29462481301.pdf
    • https://cdn.shopify.com/s/files/1/0457/8728/3612/files/regezafi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8547/1656/files/dewidefejazutesusos.pdf
    • https://cdn.shopify.com/s/files/1/0432/7332/2664/files/zetaboxiginumejaburo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9117/3278/files/54444947859.pdf
    • https://cdn.shopify.com/s/files/1/0463/5390/7869/files/aloha_soft_bed_sheet_sets.pdf
    • https://cdn.shopify.com/s/files/1/0438/0711/3373/files/reading_samples_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/9568/7328/files/budget_planning.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_off0000655e.bin
4e855cf65f5a80d7050ff5031e9cea028c2ffc1a3395d9e0eac61978ee798eb1
pdf-font-stream PDF embedded font (sfnt) at offset 0x655E 4892 bytes
font_01_sfnt_off000075eb.bin
7eb3532bf62b9a42f272d33fe0488d6b77e0e76976abfb312197f1587f22ca9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x75EB 4352 bytes
font_02_sfnt_off000083c6.bin
0092b59896daa284648a4f7a2c965715a6ab2b25b6f0b5fd546460c2501d9e24
pdf-font-stream PDF embedded font (sfnt) at offset 0x83C6 11076 bytes