Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef9602a15b36447…

MALICIOUS

PDF

34.0 KB Created: 2020-08-15 14:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3833084afe970588766a3defc8ecc880 SHA-1: bae020a0d937f7cc70aa1ffa6e57e639512152e5 SHA-256: 8ef9602a15b364474bb2760ee6992fd7a0d7a6a0026ca57795ca94bcd3291385
152 Risk Score

Malware Insights

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

This PDF document contains a critical heuristic firing indicating it's a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=shooting+games+apk%252B+data'. The document body, though heavily obfuscated, contains text related to 'shooting games apk data', aligning with the lure. The presence of a large number of external PDF links, many hosted on cdn.shopify.com, suggests a link farm used for SEO poisoning or distributing malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/pify?keyword=shooting+games+apk%252B+data
    • http://files.coastal-media.co.uk/uploads/1/3/0/7/130739570/romefeg_dasabubot_gilipivafi_zoxonijo.pdf
    • http://files.mathzaptutoring.com/uploads/1/3/0/8/130874128/3793394.pdf
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/igcse_biology_notes_0610.pdf
    • https://cdn.shopify.com/s/files/1/0433/9620/2661/files/nbc_architecture_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/3928/3608/files/70854493187.pdf
    • https://cdn.shopify.com/s/files/1/0439/1760/7067/files/conduct_verb_forms.pdf
    • https://cdn.shopify.com/s/files/1/0435/8540/5089/files/gexurururu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/90379225571.pdf
    • https://cdn.shopify.com/s/files/1/0428/5435/1015/files/the_beekeeper_of_aleppo_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/1207/7206/files/92856385998.pdf
    • https://cdn.shopify.com/s/files/1/0437/7359/1701/files/84445284469.pdf
    • https://cdn.shopify.com/s/files/1/0437/9105/7058/files/advanced_accounting_13th_edition_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/5039/2984/files/lobodederajedefij.pdf
    • https://cdn.shopify.com/s/files/1/0433/8014/6339/files/faxikifazojo.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_off0000476e.bin
499423857cf0de249c1e6b1881b6680dc0fcdbd7ba3477b1f702251d984e00ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x476E 5412 bytes
font_01_sfnt_off000059a5.bin
e91ac4c50ebf21b1f1fb822b08db23e006c090ca2bfde07e74e85d67caacbb01
pdf-font-stream PDF embedded font (sfnt) at offset 0x59A5 9892 bytes