Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf1b8d7e93da3b25…

MALICIOUS

PDF

53.4 KB Created: 2020-08-13 21:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff349d49aa040434934ed07d3e8a5aee SHA-1: 2aa95e577912d4c788d3213ef9d6a74cc2d238d6 SHA-256: cf1b8d7e93da3b25e119091c54e65b522f25df03fc5a8d51ea650a39293849da
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to domains that host further PDF files, suggesting a link farm for SEO poisoning. The primary malicious link redirects to 'ttraff.ru', which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for a 'cryptic quiz answer key'. No scripts were extracted from this sample.

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/pify?keyword=cryptic+quiz+e-+9+answer+key
    • http://files.jragourdart.com/uploads/1/3/1/4/131406749/3114f1dc136d.pdf
    • http://zekit.warandpeacebuilding.com/uploads/1/3/1/3/131383309/nusebusug_tozedireveje_kuzakukekuk_bibikamab.pdf
    • http://files.elitehometeamllc.com/uploads/1/3/0/9/130969440/184f0c990db23fb.pdf
    • http://files.equusmedendi.com/uploads/1/3/0/7/130739719/2747708.pdf
    • http://files.ewb-utsa.org/uploads/1/3/1/4/131437236/gojejabe-movatuge-zusefisebu.pdf
    • http://files.ewb-ut
    • https://cdn.shopify.com/s/files/1/0429/7038/2490/files/80203050745.pdf
    • https://cdn.shopify.com/s/files/1/0435/7878/5951/files/english_conversation_lessons_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kebiwubinixakagaxirefu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3551/6318/files/lolakokagapapunazafegar.pdf
    • https://cdn.shopify.com/s/files/1/0427/6859/7158/files/android_developer_guide_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/1648/6040/files/canadian_accreditation_standards_for_hospitals.pdf
    • https://cdn.shopify.com/s/files/1/0438/4056/9494/files/manual_autocad_civil_3d_2020_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0431/8298/1278/files/mukalapesemimulowipibut.pdf
    • https://cdn.shopify.com/s/files/1/0429/6726/9532/files/tenizibukatibizalu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4638/7367/files/big_data_concepts_and_architecture.pdf
    • https://cdn.shopify.com/s/files/1/0432/9196/7652/files/nufufununixonenowuxebojab.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/64630415929.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_off00006c92.bin
2c0663fcfd3c2802c3afaffd80ff40695c802c323bf86d314ecaf934ce3d6b8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C92 3304 bytes
font_01_sfnt_off0000786c.bin
c827d5aa42acd6c541a5010eda13211091e0d91cec9baf1789af223b6be084cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x786C 5420 bytes
font_02_sfnt_off00008b18.bin
c22e6b27e5af80c132b0286b648c01ac1c0a1f7352fc32a51293d3c2db9ed443		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B18 11464 bytes
font_03_sfnt_off0000b245.bin
31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB245 16204 bytes

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