Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7a1b7f5fbb1a8d…

MALICIOUS

PDF

48.9 KB Created: 2020-08-10 02:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7970c1a0c26b71bbf4bb269f9734e111 SHA-1: 232af57d2d0b60ccbfd541fc9effa5107b3055f9 SHA-256: 9a7a1b7f5fbb1a8dcb1645580ff7fc05136441db4026789a0fff97a9e1e28882
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=first+and+second+conditional+exercises+multiple+choice+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect users to malicious infrastructure. The presence of numerous other links, some pointing to benign Shopify domains, suggests a link farm or SEO poisoning tactic to mask the malicious redirector.

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=first+and+second+conditional+exercises+multiple+choice+pdf
    • http://files.exetermindfulnesswelcome.com/uploads/1/3/0/8/130814411/5e89076.pdf
    • http://files.quantumology.net/uploads/1/3/0/8/130874300/246331.pdf
    • http://renuko.deanteamgolfcartsaccessories.com/uploads/1/3/2/7/132740214/2681211.pdf
    • https://cdn.shopify.com/s/files/1/0435/5883/0231/files/46187035652.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5275/files/buralobopituvogiziv.pdf
    • https://cdn.shopify.com/s/files/1/0436/3033/0016/files/59166378728.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1650/files/autonics_catalogo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4106/2040/files/blink-_182_flyswatter.pdf
    • https://cdn.shopify.com/s/files/1/0446/6540/5603/files/aulas_de_violo_para_iniciantes.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9571/files/advantages_disadvantages_mother_tongue_based_multilingual_education.pdf
    • https://cdn.shopify.com/s/files/1/0429/2316/3801/files/51537675880.pdf
    • https://cdn.shopify.com/s/files/1/0429/9826/8065/files/medical_certificate_for_school.pdf
    • https://cdn.shopify.com/s/files/1/0433/3551/6318/files/the_secret_lives_of_alexandra_david_neel.pdf
    • https://cdn.shopify.com/s/files/1/0433/8014/6339/files/62771060973.pdf
    • https://cdn.shopify.com/s/files/1/0432/9986/4734/files/xatavanivu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8482/5247/files/1768788134.pdf
    • https://cdn.shopify.com/s/files/1/0441/0189/4296/files/english_to_afrikaans_dictionary_download_free.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_off0000637f.bin
2813fbf9c3e2853246f4289840e8475d0debcf6116266b0afce406041a757351
pdf-font-stream PDF embedded font (sfnt) at offset 0x637F 5416 bytes
font_01_sfnt_off000075cc.bin
957f9b733cdbb4515973ee6f85257d635e6d456f45645c805188e0108296128a
pdf-font-stream PDF embedded font (sfnt) at offset 0x75CC 14096 bytes
font_02_sfnt_off0000a15c.bin
df1d2c903cabdf2976887e260da0b25217edeb5ce2b71f315001024534e8e210
pdf-font-stream PDF embedded font (sfnt) at offset 0xA15C 16060 bytes