Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7303ae356634da9…

MALICIOUS

PDF

45.8 KB Created: 2020-08-28 21:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae459a362a6cdc2a6b75b1c52e34a8ca SHA-1: 3ec94900622a017f82e94df140842d607bf92607 SHA-256: c7303ae356634da94b26f22d753142aa1b571f92507469893102a385f46a3ed9
160 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=computer+finder+quiz'. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs. The document body, though heavily obfuscated, contains the same malicious URL and references to a 'computer finder quiz', suggesting a social engineering lure. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates that this PDF might be part of a multi-stage attack where the user is prompted to decrypt an archive.

Heuristics 4

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=computer+finder+quiz
    • https://static.usrfiles.com/ugd/b8c837_0ad74317eeaf4f898687327d61875ccd.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc315ba13a37423eb33f7e721aefa94c.pdf
    • https://static.usrfiles.com/ugd/b8c837_15b281b7a1174926accdf296b76d35f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c60dc9215f24256a5f9b967047a8e19.pdf
    • https://static.usrfiles.com/ugd/b8c837_70ecd7a810a944bd9e73a6ad259d29e1.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29883534071.pdf
    • https://cdn.shopify.com/s/files/1/0465/5045/0326/files/sara_bareilles_love_song.pdf
    • https://cdn.shopify.com/s/files/1/0438/5302/1334/files/algoritmi_cubo_di_rubik.pdf
    • https://cdn.shopify.com/s/files/1/0431/6728/5408/files/zezalewojonovijeximi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6942/3269/files/33669978801.pdf
    • https://cdn.shopify.com/s/files/1/0433/0645/1094/files/ruretekejuxadefelu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2460/5599/files/6140891949.pdf
    • https://cdn.shopify.com/s/files/1/0433/9790/6589/files/69630124146.pdf
    • https://cdn.shopify.com/s/files/1/0428/9318/1095/files/gawepasuzuxedisek.pdf
    • https://cdn.shopify.com/s/files/1/0430/7035/7661/files/visual_data_storytelling_with_tableau.pdf
    • https://cdn.shopify.com/s/files/1/0434/5312/0664/files/teziboxoradaranij.pdf
    • https://cdn.shopify.com/s/files/1/0435/8186/6143/files/nemesis_agatha_christie.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_off0000678f.bin
29e5c0d3318bb4034215a44927778db61fba413b8d5483d106d17f2c908fcb72
pdf-font-stream PDF embedded font (sfnt) at offset 0x678F 4848 bytes
font_01_sfnt_off000077f6.bin
2b8681a0fee73c6d6e837308fe4ab7e8d53a41e4cd87c458ef3e80a453f6fb2a
pdf-font-stream PDF embedded font (sfnt) at offset 0x77F6 10688 bytes
font_02_sfnt_off00009c55.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C55 4324 bytes