Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8731676140c372b…

MALICIOUS

PDF

42.4 KB Created: 2020-08-18 20:39:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a30e70adee3d1a58d904ac1f99b2e8d5 SHA-1: 2fad2e611046c06977547d18607c5e08d113b714 SHA-256: b8731676140c372b6772eed34d5d8ff40a0b18d28e549a2da7e17f572a41db3a
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=comparison+of+modifiers+worksheet'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on shopify.com, but some on potentially malicious domains like 'files.elynyd.com' and 'jitule.mahsasalali.com'. The document body, though heavily obfuscated, contains references to the worksheet and the malicious redirector URL, suggesting a lure to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.cc/pify?keyword=comparison+of+modifiers+worksheet
    • http://files.elynyd.com/uploads/1/3/0/9/130969018/penadoxuvuxovig_xafokamajetawi_neripu.pdf
    • http://jitule.mahsasalali.com/uploads/1/3/0/8/130874493/wuvawilunawido.pdf
    • https://cdn.shopify.com/s/files/1/0430/8264/5665/files/55619030936.pdf
    • https://cdn.shopify.com/s/files/1/0434/1560/1319/files/bedelemojixuruxopuledaxu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0311/7721/files/kvs_admission_registration_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/8316/0995/files/41104535446.pdf
    • https://cdn.shopify.com/s/files/1/0450/1841/5254/files/77473626560.pdf
    • https://cdn.shopify.com/s/files/1/0434/8598/6982/files/code_pokemon_vert_feuille_emulateur_android.pdf
    • https://cdn.shopify.com/s/files/1/0435/1413/4692/files/farefukawozumikike.pdf
    • https://cdn.shopify.com/s/files/1/0435/8258/7037/files/news_reporter_jobs_in_indore.pdf
    • https://cdn.shopify.com/s/files/1/0451/0230/1349/files/xfdl_to_converter.pdf
    • https://cdn.shopify.com/s/files/1/0429/1795/3702/files/95564850293.pdf
    • https://cdn.shopify.com/s/files/1/0433/8375/0821/files/fopugerorevedizeriwenel.pdf
    • https://cdn.shopify.com/s/files/1/0432/5546/4104/files/35965160350.pdf
    • https://cdn.shopify.com/s/files/1/0437/3620/3415/files/adobe_acrobat_word_to_converter_software_free_download.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_off0000597a.bin
653d09b9ba98324feb4179650125495554ace973b770c3243965009197c6e0a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x597A 5216 bytes
font_01_sfnt_off00006b16.bin
04becf5bebc9f230116493353e297a7f7837a0f7d554dcda723865214d0c84df
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B16 10364 bytes
font_02_sfnt_off00008e94.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E94 4324 bytes