Malicious PDF — malware analysis report

Static analysis result for SHA-256 2416cf02715c9774…

MALICIOUS

PDF

40.6 KB Created: 2020-08-19 07:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8accb099cc828222ada1f071c89a17fd SHA-1: 4525f16fc362f14fd7bf957337be80682d0d8d38 SHA-256: 2416cf02715c97744c5fbea15c7a75aad3ad26f88e4a7f18203222fe8281a24f
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 external resources, indicating a link farm. One critical heuristic firing identified a link to a known malicious redirector, ttraff.com, which is used to lure users to a malicious site. The document body, though heavily obfuscated, contains the text 'Short division with decimal answers worksheet' and the malicious URL, suggesting a social engineering lure. The presence of numerous Shopify-hosted PDF links further supports the link farm heuristic.

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=short+division+with+decimal+answers+worksheet
    • http://fulasa.krsmithphotography.com/uploads/1/3/1/4/131408061/7524817.pdf
    • http://files.varrismarketing.com/uploads/1/3/0/7/130740055/289f0f4def652ce.pdf
    • http://puzibisek.lasalette-church.org/uploads/1/3/0/7/130776049/da3ae7aa75a8.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/17721531589.pdf
    • https://cdn.shopify.com/s/files/1/0429/2670/2758/files/bach_little_prelude_in_c_major.pdf
    • https://cdn.shopify.com/s/files/1/0434/0105/2323/files/vuvijumupedeberodapizadak.pdf
    • https://cdn.shopify.com/s/files/1/0431/4506/8699/files/82032160532.pdf
    • https://cdn.shopify.com/s/files/1/0437/2286/6839/files/14901493406.pdf
    • https://cdn.shopify.com/s/files/1/0433/1044/8798/files/48757823350.pdf
    • https://cdn.shopify.com/s/files/1/0435/6397/4805/files/kill_e_type_item.pdf
    • https://cdn.shopify.com/s/files/1/0428/5179/5107/files/tigekivifujobakazupofe.pdf
    • https://cdn.shopify.com/s/files/1/0439/5565/0718/files/vufuvawesina.pdf
    • https://cdn.shopify.com/s/files/1/0434/2674/2421/files/75120694461.pdf
    • https://cdn.shopify.com/s/files/1/0429/9754/7157/files/aj_hoge_effortless_english.pdf
    • https://cdn.shopify.com/s/files/1/0430/0128/2711/files/25340184420.pdf
    • https://cdn.shopify.com/s/files/1/0437/6359/7473/files/brush_pen_worksheets.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_off00005e7c.bin
32e6d71e0f7240f3aac248cafca84870256feeb3a38d80de436cf6394c14c016		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E7C 5496 bytes
font_01_sfnt_off00007113.bin
bcb80a8e4fb48c2c775cec6e83b940f0c4d5ebeb33489dc65712e1bdeb8662db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7113 10668 bytes

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