Malicious PDF — malware analysis report

Static analysis result for SHA-256 5271805f58dc172f…

MALICIOUS

PDF

39.4 KB Created: 2020-08-30 22:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9611c9321b674dab3390d272e8ccec3e SHA-1: bec1b20538f75b75d221fac30e25fd0604f14291 SHA-256: 5271805f58dc172fecfa9bc1b00a2b00df164db224c39eebd6128d0ae6167aaa
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, with one heuristic specifically identifying it as a PDF SEO link farm. The primary malicious URL, https://ttraff.ru/wix?keyword=adjectif+qualificatif+pdf+exercice, is a redirector. The document body is heavily obfuscated, but the presence of numerous external links suggests a campaign focused on traffic generation or hosting malicious content indirectly.

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=adjectif+qualificatif+pdf+exercice
    • https://static.usrfiles.com/ugd/18122d_9e6f4058192f4d14bddb5033249ef475.pdf
    • https://static.usrfiles.com/ugd/b8c837_4259170dd6614c77b0ad88628532af12.pdf
    • https://static.usrfiles.com/ugd/a59130_17cf7bcdb75a4c6b9ea362a5e22164a6.pdf
    • https://static.usrfiles.com/ugd/10b11f_33d992a08b7f42c69a3ded9754bcf293.pdf
    • https://cdn.shopify.com/s/files/1/0432/3855/5805/files/64164942034.pdf
    • https://cdn.shopify.com/s/files/1/0432/8184/2341/files/78162337647.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/python_how_to_print_2_decimal_places.pdf
    • https://cdn.shopify.com/s/files/1/0435/0047/0438/files/16918220159.pdf
    • https://cdn.shopify.com/s/files/1/0432/8092/4837/files/95387452411.pdf
    • https://cdn.shopify.com/s/files/1/0433/1218/5494/files/income_tax_slab_for_financial_year_2020_19.pdf
    • https://cdn.shopify.com/s/files/1/0431/0741/8273/files/16898751018.pdf
    • https://cdn.shopify.com/s/files/1/0429/4007/2092/files/98189072803.pdf
    • https://cdn.shopify.com/s/files/1/0432/6830/9152/files/doing_economics_greenlaw.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_off00005bb7.bin
c3b383320ab89816a2b9b6b45eada7bdd381ac51270b32e2d73c3d9acf317a3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BB7 5232 bytes
font_01_sfnt_off00006d97.bin
3520b1ddb3f5f0c7cdb5e0532a0d31fd8f098e6712878011619ae7b64b1c17ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D97 10500 bytes

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