Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b4903c1bb465ef6…

MALICIOUS

PDF

58.0 KB Created: 2020-08-29 17:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b817674c3d0a9bbb307e832c7dd4a08 SHA-1: 6460d61c88a4021dedb982713d23ff2f008187bd SHA-256: 9b4903c1bb465ef695fc3a7f7f9236fefdd53e2f2aa5969cac6c7e13923436ec
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=final+fantasy+12+action+replay+max+c'. This URL is presented within the document body, likely as a lure to entice users to click and be redirected to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous other PDF links, many pointing to Shopify, suggests a link farm or SEO poisoning attempt to distribute the malicious content.

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=final+fantasy+12+action+replay+max+c
    • https://cdn.shopify.com/s/files/1/0433/3276/3801/files/baghban_film_song.pdf
    • https://cdn.shopify.com/s/files/1/0436/0539/3570/files/algebra_2_chapter_2_test_form_g.pdf
    • https://cdn.shopify.com/s/files/1/0436/4202/8182/files/genajowuwabugazifu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4203/7150/files/23089832640.pdf
    • https://cdn.shopify.com/s/files/1/0433/8935/4142/files/velefijumer.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f42116102f64ca3866508ef0553202b.pdf
    • https://static.usrfiles.com/ugd/b8c837_664361dce9974642b505ccc14f54d4f4.pdf
    • https://static.usrfiles.com/ugd/b8c837_d70c5c6f37024ce0901cfea14c0efcb7.pdf
    • https://static.usrfiles.com/ugd/b8c837_051ad0a2673f4287b6d7440a6db212f2.pdf
    • https://static.usrfiles.com/ugd/dd4472_0a2b7ab302954725a17fc0cde9ee0185.pdf
    • https://static.usrfiles.com/ugd/b8c837_1cbf32c67fcd438ebdac23d0626f80df.pdf
    • https://static.usrfiles.com/ugd/b8c837_c2a34f99e45c4631a1cac9d382272220.pdf
    • https://static.usrfiles.com/ugd/b8c837_a9cc06c6fb374e959498cb5485af8591.pdf
    • https://static.usrfiles.com/ugd/b8c837_fb8832ae30a74c23af99b700dc1bf57d.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_off0000952f.bin
8fbb21ac663e9db73456532b8fb171f5ba32696426b578d3492d5e96455476c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x952F 5472 bytes
font_01_sfnt_off0000a7c3.bin
7829a5e3148c3d2839fae7f755c0df71b20c7c274f29073f38c3a752759661c9
pdf-font-stream PDF embedded font (sfnt) at offset 0xA7C3 16140 bytes