Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a353fd17db41538…

MALICIOUS

PDF

36.7 KB Created: 2020-08-11 17:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa4a524eadb79f81c6d4ac2a44599781 SHA-1: 6725c63a13aee6bc5f7dbbae78e81b124005352b SHA-256: 8a353fd17db4153829a0dd24222b8daf9d44373b54ae3951c31cf69543bc70c9
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass external link farm, with one critical link pointing to a known malicious redirector. The document body text, though heavily obfuscated, contains the same lure text as the malicious URL, suggesting a social engineering attempt to trick users into downloading a malicious file. The presence of a visual download button further supports this. The primary malicious IOC is the redirector URL.

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.cc/pify?keyword=fybsc+it+imperative+programming+pdf
    • http://files.gradeseven.nestmusic.org/uploads/1/3/0/7/130775561/8575453.pdf
    • http://kimatebak.bhi5.com/uploads/1/3/1/4/131408738/3796223.pdf
    • http://virape.transinthecity.co.uk/uploads/1/3/0/7/130740044/8939505.pdf
    • https://cdn.shopify.com/s/files/1/0428/9747/3699/files/xuvuwove.pdf
    • https://cdn.shopify.com/s/files/1/0431/6974/2999/files/55843603846.pdf
    • https://cdn.shopify.com/s/files/1/0437/7644/2519/files/33233283171.pdf
    • https://cdn.shopify.com/s/files/1/0430/4571/6129/files/getepakumalomikumarofot.pdf
    • https://cdn.shopify.com/s/files/1/0434/0816/2974/files/pojeberixiwavimagiligu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0229/8521/files/lidetoguvebemekijowakox.pdf
    • https://cdn.shopify.com/s/files/1/0433/2650/5128/files/uk_tier_4_visa_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0429/2067/3433/files/activate_a2_student_s_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/8198/2361/files/duwam.pdf
    • https://cdn.shopify.com/s/files/1/0455/6845/8917/files/billetes_didacticos_mexicanos_para_imprimir.pdf
    • https://cdn.shopify.com/s/files/1/0435/0722/0635/files/haggadah_text_english.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f9d.bin
3bfd97b19b2128df9bda452632429eeb8c9083b3676bf85aa0aa277e18696220		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F9D 5700 bytes
font_01_sfnt_off000062ed.bin
3ac3e79e178349264c266f6e847f7826f8660a2bae2261661ca3be400474ac6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62ED 10256 bytes

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