Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b3ec73a224672f…

MALICIOUS

PDF

36.8 KB Created: 2020-08-18 14:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 503a03567c155a8555c0f4cb0a3b587a SHA-1: e008f0edde5a18a3db2840d26d7005f7fa6b2369 SHA-256: b5b3ec73a224672fc2d6faab8bc363f59040ba94a6cd885a0646093cbc10867e
120 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a worksheet, which is likely a lure to encourage clicks on the malicious links. The presence of a link farm further supports the intent to drive traffic to external sites. 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.cc/pify?keyword=commas+in+sentences+worksheet+for+grade+1
    • http://files.ayalalandalviera.com/uploads/1/3/2/3/132303270/6075823.pdf
    • http://wuzakope.nottinghamyoungmusicians.co.uk/uploads/1/3/1/3/131383329/vopatededuxasebuf.pdf
    • http://files.valleyharvestmarathon.ca/uploads/1/3/2/6/132696483/8157663.pdf
    • https://cdn.shopify.com/s/files/1/0429/4826/4089/files/brown_bear_brown_bear_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/2668/5850/files/beginner_english_reading.pdf
    • https://cdn.shopify.com/s/files/1/0432/4560/0936/files/63075656415.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/9142282406.pdf
    • https://cdn.shopify.com/s/files/1/0434/9604/6752/files/nefeva.pdf
    • https://cdn.shopify.com/s/files/1/0429/4544/6044/files/tajunegivububewunafuxux.pdf
    • https://cdn.shopify.com/s/files/1/0431/3966/1981/files/26502318991.pdf
    • https://cdn.shopify.com/s/files/1/0437/7778/6018/files/81009853019.pdf
    • https://cdn.shopify.com/s/files/1/0441/4413/2248/files/understanding_personal_finance_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0436/0732/6882/files/60326649089.pdf
    • https://cdn.shopify.com/s/files/1/0439/7400/0798/files/33493386994.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_off000050bb.bin
a12bf5e34fde4419a7460a6fcc17ed4e9e18bdd7d598ef972ef1bf1f3bf8779d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50BB 5516 bytes
font_01_sfnt_off00006360.bin
a949ed0f5b70342e79ea8ce9b4f4a5960bfca84ebaf323c58226b0cb45b22482		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6360 10260 bytes

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