Malicious PDF — malware analysis report

Static analysis result for SHA-256 55fefcc7edb60f5e…

MALICIOUS

PDF

47.7 KB Created: 2020-08-11 18:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 023b00d15c10de32a7714a64545d3c59 SHA-1: 1e0a3f017fbb965151ccecb6f4ae5e9d0ba0cfef SHA-256: 55fefcc7edb60f5ea31c983f8ec70142f089341dfdae0cc8a00b101723b183d0
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.ru/pify?keyword=artificial+neural+network+textbook+pdf'. The document body, though heavily obfuscated, also contains this URL and other links pointing to various PDF files hosted on external domains. This suggests a link farm or SEO spam campaign designed to drive traffic to malicious infrastructure.

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=artificial+neural+network+textbook+pdf
    • http://zowimofe.pleasurepointstattoos.com/uploads/1/3/0/7/130776031/vugirekolofigexi.pdf
    • http://files.confessionsofanerd.com/uploads/1/3/1/3/131383657/tiwuva.pdf
    • http://files.defriasconsulting.com/uploads/1/3/0/7/130738792/dc308defb4.pdf
    • http://manumabup.ombodieslondon.com/uploads/1/3/1/0/131070450/2115868.pdf
    • http://files.watermarqdesign.com/uploads/1/3/1/4/131406892/dojatejoramunubivab.pdf
    • https://cdn.shopify.com/s/files/1/0448/4261/4945/files/the_adventures_of_tom_sawyer_with_pictures.pdf
    • https://cdn.shopify.com/s/files/1/0432/7066/8453/files/anti_anemic_drugs.pdf
    • https://cdn.shopify.com/s/files/1/0431/0709/0581/files/87491804362.pdf
    • https://cdn.shopify.com/s/files/1/0433/6313/9733/files/types_of_cognitive_biases.pdf
    • https://cdn.shopify.com/s/files/1/0434/0911/3240/files/16894766436.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/system_dynamics_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/6818/6015/files/fabujuzerijajakates.pdf
    • https://cdn.shopify.com/s/files/1/0433/9499/0243/files/difference_between_phonetics_and_phonology_examples.pdf
    • https://cdn.shopify.com/s/files/1/0434/0688/5027/files/69780571590.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/lilokezifewosojet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/949986333.pdf
    • https://cdn.shopify.com/s/files/1/0436/4589/4816/files/ways_of_the_world_3rd_edition_chapter_11.pdf
    • https://cdn.shopify.com/s/files/1/0436/6457/2569/files/irc_channels_for_textbooks.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d6b.bin
ee4e5cd152d99914555d1d3d79260d97999ea0a107b3863cce7f5c31a042cd76
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D6B 5208 bytes
font_01_sfnt_off00007f2f.bin
5566dd4f119e57cc9cfc365e9bcce99f59bdfb5d0140a62c738178f5ff53297a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F2F 10472 bytes
font_02_sfnt_off0000a2d5.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0xA2D5 4324 bytes