Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff4ac91942841d7…

MALICIOUS

PDF

53.2 KB Created: 2020-08-22 18:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02a0e2923fa8e796b3473d02044672d3 SHA-1: 85b3fb12ff2ced6957eb9e49b1126773277d7824 SHA-256: fff4ac91942841d7e40445cdbc3efe36e7daa4407944418530a9db287d44a353
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to rooting Android devices, suggesting a lure to a malicious site. The presence of a link farm and a critical heuristic firing for a malicious redirector strongly indicates a phishing or malware distribution attempt.

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.com/pify?keyword=root+android+7.+0+without+computer
    • http://files.gaindetalks.com/uploads/1/3/0/8/130874629/dojoja-kefuzegomoli-wadab.pdf
    • http://files.vibrows.ca/uploads/1/3/0/7/130774973/1475345.pdf
    • http://sukuluni.mindandmusecrafts.com/uploads/1/3/0/7/130738732/fategupotademik.pdf
    • http://dobetajuj.msspadc.org/uploads/1/3/1/4/131482952/88c3d0c.pdf
    • http://files.rbmt.org/uploads/1/3/1/4/131437891/6722de6a64bc633.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/sofowadi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7144/6939/files/judosumasis.pdf
    • https://cdn.shopify.com/s/files/1/0432/9147/6133/files/tubebifubukopo.pdf
    • https://cdn.shopify.com/s/files/1/0439/7583/5806/files/50501306430.pdf
    • https://cdn.shopify.com/s/files/1/0434/0000/3747/files/jusejanugufajas.pdf
    • https://cdn.shopify.com/s/files/1/0436/1807/4786/files/important_adjectives_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0439/5014/5704/files/sesax.pdf
    • https://cdn.shopify.com/s/files/1/0432/3636/0351/files/asynchronous_generator_working.pdf
    • https://cdn.shopify.com/s/files/1/0436/9462/0837/files/9235601961.pdf
    • https://cdn.shopify.com/s/files/1/0435/8157/1227/files/thailand_basic_words.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_off0000929f.bin
80e740ecc382c4560f46781ac262195491e5bea43232f985391b07f331ba82db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x929F 5456 bytes
font_01_sfnt_off0000a51d.bin
fa0336724c18f60fbccf50bb6bc195c86db24695bf704e09bc8f6d85ce47d61b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA51D 10192 bytes

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