Malicious PDF — malware analysis report

Static analysis result for SHA-256 e71ffb8c459b4512…

MALICIOUS

PDF

41.7 KB Created: 2020-08-20 18:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3501835ac29230bc84a4452daca054b SHA-1: 35381c709c0b6b8bc1aaa205f6ca4389acdbe134 SHA-256: e71ffb8c459b45125d8f057c4447b2b70cdd3a0f3b10c5fcbf749a28043d6aa1
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the ttraff.ru URL, which is a known redirector. The document body, though heavily obfuscated, contains references to the same URL, reinforcing its role in the attack. The presence of numerous links to Shopify-hosted PDFs suggests an attempt to create a link farm for SEO manipulation or to obscure the malicious redirector.

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=decision+table+questions+answers+istqb
    • http://files.jonathanacollura.com/uploads/1/3/0/8/130874338/kesofexekasitix.pdf
    • http://files.gbccollege.org/uploads/1/3/1/3/131398252/7932936.pdf
    • http://pisago.ckdpc.org/uploads/1/3/2/6/132681231/52c17362.pdf
    • https://cdn.shopify.com/s/files/1/0438/5318/5174/files/lewewekarawilomi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5657/0274/files/50735202427.pdf
    • https://cdn.shopify.com/s/files/1/0430/9227/9445/files/bavosulefuwixabozemotazis.pdf
    • https://cdn.shopify.com/s/files/1/0431/6587/6379/files/10207894758.pdf
    • https://cdn.shopify.com/s/files/1/0427/9359/9132/files/discord_font_commands.pdf
    • https://cdn.shopify.com/s/files/1/0439/3720/2344/files/12496555279.pdf
    • https://cdn.shopify.com/s/files/1/0447/5322/3829/files/bowring_treaty.pdf
    • https://cdn.shopify.com/s/files/1/0434/2385/8850/files/php_db_class.pdf
    • https://cdn.shopify.com/s/files/1/0433/5802/7928/files/rusezuvekipobebivuva.pdf
    • https://cdn.shopify.com/s/files/1/0433/7880/2846/files/68467849465.pdf
    • https://cdn.shopify.com/s/files/1/0430/8054/8503/files/jafiwudawu.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_off0000657a.bin
674f2ceac280ba68fea5575b3c4297cd2af41b20942975e80e3bc92ad8471a9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x657A 5152 bytes
font_01_sfnt_off0000771e.bin
c9c1203f47c02742a90e4fabcb2134b3aba61329a7572b055c703fdca92e93ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x771E 10284 bytes

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