Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b43fbba90874e11…

MALICIOUS

PDF

50.4 KB Created: 2020-08-30 20:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6160d2e789fbdf22276b312eac8fe890 SHA-1: 33a3f7d992196f186d59f128dc819f5ba4072323 SHA-256: 3b43fbba90874e11f81953ab117cbfadb3eb801bb0dceda856db79932965a641
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 its extensive use of embedded links, a technique often employed in SEO poisoning or link farm schemes. One critical heuristic flagged a link to a known malicious redirector at 'https://ttraff.ru/wix?keyword=the+arms+race+jigsaw+graphic+organizer+answers'. Another heuristic indicated a large number of external PDF links, with the first identified as 'https://cdn.shopify.com/s/files/1/0438/8657/5771/files/nemuvosesubomevutalaked.pdf'. The document body contains garbled text and the embedded URLs, suggesting the primary purpose is to host these links.

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=the+arms+race+jigsaw+graphic+organizer+answers
    • https://cdn.shopify.com/s/files/1/0438/8657/5771/files/nemuvosesubomevutalaked.pdf
    • https://cdn.shopify.com/s/files/1/0434/6930/8061/files/agama_islam_kelas_10.pdf
    • https://cdn.shopify.com/s/files/1/0466/7142/9797/files/63281307537.pdf
    • https://cdn.shopify.com/s/files/1/0432/9360/6048/files/clash_royale_gems_no_survey.pdf
    • https://static.usrfiles.com/ugd/b8c837_97715f0395ef4dd58396046bfa7ab6f4.pdf
    • https://static.usrfiles.com/ugd/b8c837_c2073b104cc74ced9fdaba9c8dc72939.pdf
    • https://static.usrfiles.com/ugd/b8c837_0ccab0dcb39c422a93d46f27745498c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_6422be812c0c43898afed07fbb5b8c8e.pdf
    • https://static.usrfiles.com/ugd/b8c837_9aa06bbc0fc2415db93f5d392d6eafc3.pdf
    • https://static.usrfiles.com/ugd/c0b427_460ebcac168d466e8ce1cc9e5250bbeb.pdf
    • https://static.usrfiles.com/ugd/5926b4_594efe4ca7794d968551cf301288f76c.pdf
    • https://static.usrfiles.com/ugd/b8c837_6bec7bd20ef2441ba72da88219e6da27.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd683b0eeb184becba5b53404da3e5b5.pdf
    • https://static.usrfiles.com/ugd/e745be_22600463be2a40fc98537ddf576eb974.pdf
    • https://static.usrfiles.com/ugd/b8c837_da61417200a94ceba3db15df1b75b394.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_off000078be.bin
63a510320a9a53278e1c7ba1219c18441733a7c813e41b36b64c20954ec1b96d
pdf-font-stream PDF embedded font (sfnt) at offset 0x78BE 5192 bytes
font_01_sfnt_off00008a50.bin
eb0779cad416b8ed54c6b34ad04dc3c1eb910e44b33b83116d52a20695e015f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A50 10580 bytes
font_02_sfnt_off0000ae8d.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE8D 4324 bytes