Malicious PDF — malware analysis report

Static analysis result for SHA-256 77dee01b9518abd6…

MALICIOUS

PDF

42.1 KB Created: 2020-08-24 17:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a60500ed0202c20095c4176a7014aa2 SHA-1: 8745d09f242ae51130c37b7f3b4108f313b408cd SHA-256: 77dee01b9518abd6b894c2d2f762c9979f7ebb7804eaaf6a0f003477f6edb3d6
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a technique often used for SEO poisoning or to redirect users to malicious sites. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is presented in the context of 'counting pictures worksheets'. The document body, though heavily obfuscated, contains text related to worksheets and the malicious URL, reinforcing the lure. The presence of a link farm further suggests an attempt to manipulate search results or distribute malicious content.

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.com/pify?keyword=counting+pictures+worksheets+1-+10
    • http://files.nonfictionfilm.com/uploads/1/3/0/8/130814195/499951.pdf
    • https://cdn.shopify.com/s/files/1/0437/1379/0106/files/arabic_calligraphy_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0432/5936/3488/files/newolusisofosoridago.pdf
    • https://cdn.shopify.com/s/files/1/0428/8030/3270/files/xofafoxofipavi.pdf
    • https://cdn.shopify.com/s/files/1/0445/7899/6383/files/93725019306.pdf
    • https://cdn.shopify.com/s/files/1/0437/3318/8759/files/88660507357.pdf
    • https://cdn.shopify.com/s/files/1/0430/6560/6301/files/77465572058.pdf
    • https://cdn.shopify.com/s/files/1/0427/6820/3942/files/22282594777.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3531/files/farokapekukozagi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7100/3031/files/91268791687.pdf
    • https://cdn.shopify.com/s/files/1/0429/5072/1699/files/normal_lumbar_spine_mri_report.pdf
    • https://cdn.shopify.com/s/files/1/0434/6000/1957/files/44848868506.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_off000066af.bin
45b15c5974ed13083a908efbad41af83b8c9e31260a47136bfc9bb7d46f5609a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66AF 5240 bytes
font_01_sfnt_off000078aa.bin
fe4707c6fef5cbffd813727195357e52267d9485d9ead64ed91d88196c355ec9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78AA 10192 bytes

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