Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2841e5fb95a4ba9…

MALICIOUS

PDF

52.8 KB Created: 2020-08-29 20:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97f116bed24360ccf5ddcf2154c0f8c0 SHA-1: 4befe803e14ab8fa573591db43b3c4a6cd0c8bfa SHA-256: c2841e5fb95a4ba92e988b11313fcedda4cffd293212965018833f2c89d09628
150 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 a redirector service (ttraff.cc). The document body, though heavily obfuscated, contains text that appears to be a lure related to 'exercicios 8 ano doc'. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms that at least one URL leads to malicious infrastructure. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, likely to obscure the malicious redirector. 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.cc/wix?keyword=angulo+central+e+inscrito+exercicios+8+ano+doc
    • https://cdn.shopify.com/s/files/1/0434/7002/8966/files/business_process_mapping.pdf
    • https://cdn.shopify.com/s/files/1/0440/8875/4328/files/lupurug.pdf
    • https://cdn.shopify.com/s/files/1/0431/8570/1019/files/16678111036.pdf
    • https://cdn.shopify.com/s/files/1/0431/6073/1803/files/57362451654.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/cdc_child_vaccine.pdf
    • https://cdn.shopify.com/s/files/1/0435/8035/8815/files/41653862585.pdf
    • https://cdn.shopify.com/s/files/1/0431/5129/4619/files/vojorudoduwedizomowawid.pdf
    • https://cdn.shopify.com/s/files/1/0432/1227/5876/files/dovipesidonidezigiwozozu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6451/4967/files/56932911593.pdf
    • https://cdn.shopify.com/s/files/1/0429/5147/5351/files/89437669288.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89120948070.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40369191557.pdf
    • https://cdn.shopify.com/s/files/1/0437/7359/1701/files/49676313385.pdf
    • https://cdn.shopify.com/s/files/1/0439/7514/7678/files/descargar_musica_de_la_adictiva_banda_san_jose.pdf
    • https://cdn.shopify.com/s/files/1/0428/4622/4551/files/38492377352.pdf
    • https://cdn.shopify.com/s/files/1/0430/7697/6791/files/call_blocker_with_switch_off_mod_apk.pdf
    • https://cdn.shopify.com/s/files/1/0427/8019/7031/files/advanced_analytics_with_spark_2nd_edition_free_download.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_off00007416.bin
68a62cacdba53840665a54c40a5b53324aeb2b4a7dd8f618b201361caf73966a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7416 5240 bytes
font_01_sfnt_off000085e9.bin
bab333ed24e997d95034e91ef0fe2da5f4962aa181f14d1057535ea7511429ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x85E9 16668 bytes
font_02_sfnt_off0000b61c.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xB61C 4324 bytes