Malicious PDF — malware analysis report

Static analysis result for SHA-256 862b980af7f15dae…

MALICIOUS

PDF

48.7 KB Created: 2020-08-29 21:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13fd15fbf503076cc53c7366fac7f1c9 SHA-1: 2a7a1e3b825bf33100f0554db4af4a0ad9d656c8 SHA-256: 862b980af7f15daeb46f3aca5016e008072ba4f8dead7a06e584c42363c39efb
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/wix?keyword=the+darkest+minds+book+pdf, which is the primary indicator of malicious intent, likely leading to a phishing or malware download page. The presence of a link farm suggests an attempt to game search engines for malicious distribution.

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=the+darkest+minds+book+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/javusatenugugar.pdf
    • https://cdn.shopify.com/s/files/1/0438/8909/8907/files/8148906200.pdf
    • https://cdn.shopify.com/s/files/1/0430/7773/0455/files/wokijamuderuxupazolopedi.pdf
    • https://cdn.shopify.com/s/files/1/0433/8909/1998/files/adobe_reader_offline_installer_xp.pdf
    • https://static.usrfiles.com/ugd/7f46b5_aeef6f9ed4db43a0a5e625eec56f5f2e.pdf
    • https://static.usrfiles.com/ugd/b8c837_abd7ae0231f74153a4cf2db03d9db9d9.pdf
    • https://static.usrfiles.com/ugd/314c35_8d8b3f74026b47b3af61d23497467ecd.pdf
    • https://cdn.shopify.com/s/files/1/0430/5502/2234/files/ielts_writing_tips_and_tricks.pdf
    • https://cdn.shopify.com/s/files/1/0433/6395/8938/files/73677339252.pdf
    • https://cdn.shopify.com/s/files/1/0430/2841/4618/files/fefofum.pdf
    • https://cdn.shopify.com/s/files/1/0428/2194/3463/files/joy_d1850_air_compressor_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/0767/1448/files/66373844435.pdf
    • https://cdn.shopify.com/s/files/1/0440/2610/1910/files/71902462932.pdf
    • https://cdn.shopify.com/s/files/1/0433/4852/5206/files/98322898486.pdf
    • https://cdn.shopify.com/s/files/1/0433/0949/8536/files/30223713948.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_off000079a9.bin
53251c2f68eaf2b9b587294e420012cd2efee5d8f0e0c4e9fd1d68fefeae64c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x79A9 5404 bytes
font_01_sfnt_off00008be3.bin
1758b55ae9d00bc1e05457c23b74703e90d99605d2ea98b272920e615e117975
pdf-font-stream PDF embedded font (sfnt) at offset 0x8BE3 13400 bytes