Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5b7ad7302b3157…

MALICIOUS

PDF

48.1 KB Created: 2020-08-31 14:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d05f095939d5b88997fe6bb4f6325127 SHA-1: ee676e528632cb336a150412e2837576ab503113 SHA-256: 0c5b7ad7302b315749f03795518110855890da389eb888fe48f4ca69cc443756
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that point to a known malicious redirector infrastructure, disguised with text suggesting a 'Better business bureau complaint form'. The presence of numerous external PDF links, many pointing to benign content, suggests a link farm tactic to obscure the malicious URL. The ML classifier strongly indicates malicious intent.

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=better+business+bureau+complaint+form+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/238140_67ea713fab9546a6b19188c43c257a10.pdf
    • https://static.usrfiles.com/ugd/fe83c3_602dc04c49e148a4a97c37e5cf4b076f.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_72c0304fbe5d48eca3c28f8e2690b11f.pdf
    • https://static.usrfiles.com/ugd/db1da1_fe7627ae1c9546269790aa98609f4ca4.pdf
    • https://static.usrfiles.com/ugd/87a178_526f394f24c342d6893ba5492a927201.pdf
    • https://cdn.shopify.com/s/files/1/0432/3626/2052/files/converse_platform_black_uk.pdf
    • https://cdn.shopify.com/s/files/1/0436/6044/3813/files/mathematics_for_economists_by_taro_yamane.pdf
    • https://cdn.shopify.com/s/files/1/0461/8344/8730/files/nice_guys_nigahiga_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0460/0142/2497/files/ganapati_atharvashirsha_in_marathi_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/0319/0181/files/pixesawis.pdf
    • https://static.usrfiles.com/ugd/b8c837_852f630569be4b92b6d446a9ead2a2ab.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf36f6b73d654dffb9ad9e1c2509dd58.pdf
    • https://static.usrfiles.com/ugd/bfbc46_37815d50699f4cf9883e62083bf865e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_a039bfe25fa143a4946ead262f6e1065.pdf
    • https://static.usrfiles.com/ugd/8b2c09_ffa77432d35846c09a4f5a4b41b91b34.pdf
    • https://static.usrfiles.com/ugd/b8c837_e5a80f47e18540c9970a3db75374a0a2.pdf
    • https://static.usrfiles.com/ugd/d17951_5ddd3f8396f34d2e85ecfef2c53920b2.pdf
    • https://static.usrfiles.com/ugd/c7ef1a_96d1f88054674e06965fa7788c8fb44d.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d24.bin
ac92fa14e0a393a1ce2f71dd8684986a8c8f055e260bb2426de406388dc48ab9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D24 5492 bytes
font_01_sfnt_off00008fb6.bin
11f1b8fd74d79af500262410f56acc94039cdea2e26c4841442f9f07a8e28e67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FB6 10360 bytes

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