Malicious PDF — malware analysis report

Static analysis result for SHA-256 900e3b844c4658a7…

MALICIOUS

PDF

43.2 KB Created: 2020-08-06 12:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2143f62aa38d9b01a44cec5857c7867 SHA-1: 76aa77c1cd8beb155bb5bad213260c0b2d5e1305 SHA-256: 900e3b844c4658a7e74e528cf5ede56027e2e17dcda067ecff5bd0c0e5774d8e
150 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One critical heuristic indicates a malicious redirector link to 'ttraff.ru', which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to lure users into clicking it. The ML classifier also strongly flagged this PDF as malicious.

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.ru/pify?keyword=cahier+de+vacances+cm1+pdf
    • http://files.isjl.org/uploads/1/3/1/4/131453213/85812.pdf
    • http://files.hydroshockgrafix.com/uploads/1/3/0/8/130814232/vosuvogoli.pdf
    • http://files.laura-lyman.com/uploads/1/3/1/4/131438216/9658395.pdf
    • https://cdn.shopify.com/s/files/1/0429/1805/1996/files/add_element_to_array_java.pdf
    • https://cdn.shopify.com/s/files/1/0434/5053/2001/files/91624504133.pdf
    • https://cdn.shopify.com/s/files/1/0432/2961/0141/files/zunijelax.pdf
    • https://cdn.shopify.com/s/files/1/0434/0465/6790/files/62736828973.pdf
    • https://cdn.shopify.com/s/files/1/0434/2880/6807/files/10th_class_biology_textbook_malayalam.pdf
    • https://cdn.shopify.com/s/files/1/0433/2525/9944/files/61241280744.pdf
    • https://cdn.shopify.com/s/files/1/0431/5794/6522/files/16418016750.pdf
    • https://cdn.shopify.com/s/files/1/0437/8460/1758/files/26951288716.pdf
    • https://cdn.shopify.com/s/files/1/0437/1356/0731/files/82952993067.pdf
    • https://cdn.shopify.com/s/files/1/0441/1247/8360/files/piratolalapuzutised.pdf
    • https://cdn.shopify.com/s/files/1/0428/2191/0687/files/best_gba_emulator_pc.pdf
    • https://cdn.shopify.com/s/files/1/0428/8203/9964/files/41010871962.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_off000066e5.bin
817ee9e149a11301070a6a209c2fcb1d1a1638619519979d16a65382e8a3891e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66E5 5380 bytes
font_01_sfnt_off0000790f.bin
de28304a15c231592f554e21876a0087c3acdca89d338d4a88a3ce25c4bef8ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x790F 11788 bytes

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