Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ca3800b1ca0f53…

MALICIOUS

PDF

45.7 KB Created: 2020-09-01 02:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e154a8edb5b92d42a117e492af927a6 SHA-1: d65b6ece2d8e8aa18da6e369c431488f1101ca38 SHA-256: a4ca3800b1ca0f53110405a609c8a08a073a938832070a7e817ea3f11c2aee48
120 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.me/wix?keyword=old+skype+for+windows'. This URL is presented within the document body, disguised as a download for 'Old skype for windows', indicating a social engineering lure. The file also exhibits characteristics of a PDF link farm, with numerous embedded links, many pointing to Shopify domains, likely for SEO manipulation or to obscure the primary malicious destination.

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.me/wix?keyword=old+skype+for+windows
    • https://static.usrfiles.com/ugd/a59130_5b87cfec39ed4a4cb415b244a2bf11b2.pdf
    • https://static.usrfiles.com/ugd/b8c837_e43635ec5705449cb025bf6588570ddf.pdf
    • https://static.usrfiles.com/ugd/e3834b_073951947f9e4c78a48dbfda5c6a9c71.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/909040323.pdf
    • https://cdn.shopify.com/s/files/1/0439/8612/4958/files/baseball_jersey_template.pdf
    • https://cdn.shopify.com/s/files/1/0430/9073/9361/files/multiple_versions_bible.pdf
    • https://cdn.shopify.com/s/files/1/0429/9830/0823/files/47489788114.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3784/files/convoluted_universe_book_4.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/xojimexudarewafew.pdf
    • https://cdn.shopify.com/s/files/1/0429/7850/8953/files/pufamemukisexoje.pdf
    • https://cdn.shopify.com/s/files/1/0431/4949/2384/files/demande_d_aide_au_logement_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/5353/0788/files/89830462128.pdf
    • https://cdn.shopify.com/s/files/1/0430/4899/2930/files/delinquency_on_credit_report_mean.pdf
    • https://static.usrfiles.com/ugd/b8c837_598d2ef1033543f6ab62f6f62b077c07.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_bc2f591433cb4179b6d04807d1867917.pdf
    • https://static.usrfiles.com/ugd/1c8c6c_812dcf5fddcd448ba88ebd4da99c1b4d.pdf
    • https://static.usrfiles.com/ugd/c33cdb_bf1a22531ec0418d88e9916e8e3edbc8.pdf
    • https://static.usrfiles.com/ugd/e2c250_f0c62495880b4cc1a45590a1f51ba259.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_off000074e9.bin
36b2b95d1354750c667778c7c101676d1e05e002a1463d25a42af3f4f6b970e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x74E9 5108 bytes
font_01_sfnt_off00008671.bin
452762a9800209a25910a223ec7013812cc2cc197631d2cf78408b875d357ac8
pdf-font-stream PDF embedded font (sfnt) at offset 0x8671 10436 bytes