Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa369862268f0c88…

MALICIOUS

PDF

67.1 KB Created: 2020-08-31 16:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10b1572fbcbc86c317307fd2bb0f45cd SHA-1: d10e957f56f1510c1a5033a3604ad25f3123d6fa SHA-256: fa369862268f0c881bf9a332dc8c9fe66622c9515c0fcd87cee33354ca9a9d16
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links, with one pointing to a known malicious redirector at 'https://ttraff.cc/wix?keyword=bachelor+of+law+books+pdf'. The document body, though heavily obfuscated, appears to be a lure related to 'bachelor of law books pdf'. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms the malicious nature of the redirector. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=bachelor+of+law+books+pdf
    • https://cdn.shopify.com/s/files/1/0427/6230/5702/files/daginijujatu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8977/2187/files/demowanoxanoxov.pdf
    • https://cdn.shopify.com/s/files/1/0434/1946/7927/files/ctrl_stream_kit.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99839510681.pdf
    • https://cdn.shopify.com/s/files/1/0435/2317/8656/files/bailey_love_s_short_practice_of_surgery_free_download.pdf
    • https://static.usrfiles.com/ugd/b48b60_1343065bceb14b04bba6987bbcead909.pdf
    • https://cdn.shopify.com/s/files/1/0433/9793/9367/files/41031737256.pdf
    • https://cdn.shopify.com/s/files/1/0432/8466/0380/files/kareena_kapoor_picture.pdf
    • https://cdn.shopify.com/s/files/1/0458/0956/5862/files/13398575834.pdf
    • https://cdn.shopify.com/s/files/1/0431/9671/1069/files/abu_rayhan_gojol.pdf
    • https://cdn.shopify.com/s/files/1/0432/9000/1572/files/tuwejegi.pdf
    • https://static.usrfiles.com/ugd/cf14a4_49ea903992a14f15b9df2a506e039ef0.pdf
    • https://static.usrfiles.com/ugd/e2b09b_03cc22016992413e8a0c8d61e16324f9.pdf
    • https://static.usrfiles.com/ugd/b8c837_042c7a517b0643419b96d90e413b3267.pdf
    • https://static.usrfiles.com/ugd/b8c837_85be0b9e9e034b3791094d6068d906c7.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/
    • https://cdn.shopify.com/s/files/1/0432/8466/038

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c946.bin
dd9edc26bd4dd9eed83da8db6c864ea6095a79ebaceb33130c13cf4e7c1fd583
pdf-font-stream PDF embedded font (sfnt) at offset 0xC946 5588 bytes
font_01_sfnt_off0000dc4f.bin
4fa44100523be7e7379010602927dbc6c1f4de737929f83d31ce0953712ea14d
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4F 10312 bytes