Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25af7b609d2048d…

MALICIOUS

PDF

51.1 KB Created: 2020-09-01 06:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b964601ac2327d794b2d310ffba2a1f SHA-1: 6498592164eb3543826e432f2643b4d9fcd31d7d SHA-256: e25af7b609d2048d43b58893a71bb0ae650f6a98c4eb9635793a68552d41afdb
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=add+date+stamp+to+excel+spreadsheet'. The document body, though heavily obfuscated, contains text related to 'add date stamp to excel spreadsheet' and the malicious URL, suggesting a social engineering lure. The file also exhibits characteristics of a PDF link farm, with numerous embedded links, many of which point to 'static.usrfiles.com' which was flagged as confirmed benign, but the primary redirector is malicious.

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=add+date+stamp+to+excel+spreadsheet
    • https://static.usrfiles.com/ugd/48d9a1_cee55459233b4215b10425ff0ecb0d8a.pdf
    • https://static.usrfiles.com/ugd/70c1f8_359f777703aa47f88e646743d8864f94.pdf
    • https://static.usrfiles.com/ugd/269bb8_ce1a7acffdaa44fdabd08b130fd362d2.pdf
    • https://static.usrfiles.com/ugd/96bf9d_e05c23b2a0614f35a1839d78dd05e44e.pdf
    • https://static.usrfiles.com/ugd/41a0b6_eb35a4ea0cc544588d4e4adff561810a.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_89b63d3dec4e4fd897959081efac7158.pdf
    • https://static.usrfiles.com/ugd/850f07_41db54fe958442fbb0374587ac9ceb11.pdf
    • https://static.usrfiles.com/ugd/77d535_536213052a0547a881db08267da6af33.pdf
    • https://cdn.shopify.com/s/files/1/0436/1011/2163/files/brazilian_jiu_jitsu_moves.pdf
    • https://cdn.shopify.com/s/files/1/0431/5899/5095/files/enlace_peptidico_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0433/2306/4488/files/64347422374.pdf
    • https://cdn.shopify.com/s/files/1/0429/7631/3503/files/xufowapuraguk.pdf
    • https://cdn.shopify.com/s/files/1/0434/5082/6919/files/pebetu.pdf
    • https://static.usrfiles.com/ugd/7603ae_05d22745b8164df6861559c009ea0021.pdf
    • https://static.usrfiles.com/ugd/23e9be_126944419ce74b2b9baa8f7905091252.pdf
    • https://static.usrfiles.com/ugd/61b8bf_334b5775e2a34fd9b1054b1910983924.pdf
    • https://static.usrfiles.com/ugd/822ecd_f912ac126a6a49f99da8c17e731daf17.pdf
    • https://static.usrfiles.com/ugd/c7a620_8d1a4659eb864d3ba9a0a2e50f3d9dec.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_off000066d3.bin
a9bca17178d6081044f29d8d7512bed3a516f3af01d50575995fe7162e6de1b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66D3 5004 bytes
font_01_sfnt_off000077d6.bin
c298f79bb1790154b70c7a5a3a6ac6e3812f749e1c636807093e5ea16168696e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77D6 10240 bytes
font_02_sfnt_off00009b0b.bin
e1fcaa290bc8b5aed85f312864440120c61db6abd2add9737883d56687aaee62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B0B 16232 bytes
font_03_sfnt_off0000b028.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB028 4324 bytes

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