Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba8d9535d99c7f8…

MALICIOUS

PDF

51.5 KB Created: 2020-08-30 03:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66c608bc26167363b1806e7708509f66 SHA-1: 5de6c9014de8e3a758d030409a31ac01ec5d4d63 SHA-256: 8ba8d9535d99c7f821f0737239d32abbb9f2ac6c12aa10eee88f6adcb5f5d31f
128 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, pointing to 'https://ttraff.ru/wix?keyword=junior+accountant+notes+in+hindi+pdf'. Additionally, another critical heuristic indicates a PDF link farm, suggesting an attempt to distribute content or lure users to various sites. The presence of a 'download button' heuristic further supports a malicious workflow. The document body, though heavily corrupted, contains the same suspicious URL and appears to be a lure for 'junior accountant notes'.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=junior+accountant+notes+in+hindi+pdf
    • https://static.usrfiles.com/ugd/ca32a8_97059718c2f3422bb21245323aee18c7.pdf
    • https://static.usrfiles.com/ugd/b8c837_fc9fbe74a5f4431db8ba452051342171.pdf
    • https://static.usrfiles.com/ugd/625844_29dbfc785ad34f5c968776eb3b722250.pdf
    • https://cdn.shopify.com/s/files/1/0431/7406/8390/files/mokivat.pdf
    • https://cdn.shopify.com/s/files/1/0430/3706/5370/files/35332474030.pdf
    • https://cdn.shopify.com/s/files/1/0435/7786/8443/files/sofaperitowuxibabinebu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2825/8726/files/baitul_muqaddas_history_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1918/1978/files/is-_700._a_nims_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0437/4275/7029/files/98781703314.pdf
    • https://cdn.shopify.com/s/files/1/0428/1024/5286/files/abs_workout_application.pdf
    • https://cdn.shopify.com/s/files/1/0436/6126/3001/files/belt_conveyor_components.pdf
    • https://cdn.shopify.com/s/files/1/0428/0477/3031/files/15108688037.pdf
    • https://static.usrfiles.com/ugd/760101_07b68c4c9476415cad82265167b94cad.pdf
    • https://static.usrfiles.com/ugd/286fb8_ae9e8a0e416345a8bac5edf5d46e97e4.pdf
    • https://static.usrfiles.com/ugd/b8c837_3d5ca008f8a04a2ea19d4dfe9f585da4.pdf
    • https://static.usrfiles.com/ugd/07ef24_2b51ea97609442f38f11ab3a53cfb1b7.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ea9.bin
7bb46b22355035afe7711b3bd76045b46a24afe14d755568a165469becfea03c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA9 5200 bytes
font_01_sfnt_off00007050.bin
d1876b3ff12204f7b24a0affaeb351dfb4e3a959f93e6ec71098be54007339b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7050 10164 bytes
font_02_sfnt_off00009357.bin
ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9357 16164 bytes
font_03_sfnt_off0000a8ac.bin
96c873463cc7387f496f9ca5864be542b56d4334e0fd2a048b5c0be85e6a7a64		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8AC 6868 bytes

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