Malicious PDF — malware analysis report

Static analysis result for SHA-256 75f8c7060a93a26b…

MALICIOUS

PDF

36.4 KB Created: 2020-08-30 19:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ed169f4a05c594b8714fafea6b10476 SHA-1: 61dd015f14e30af2c0bab071917cbab1707b70a9 SHA-256: 75f8c7060a93a26b4872cd417a0dd3cc192da2c40f51fcb5c6a10dec3b04f12c
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains the same URL and a list of other PDF links, suggesting a link farm or redirection tactic. 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=fallout+4+double+barrel+shotgun
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_70bdf55477a54863a2aab8f1195cbc7b.pdf
    • https://static.usrfiles.com/ugd/f459ea_ea2b22a27eaf42b4922354e098b45fa6.pdf
    • https://static.usrfiles.com/ugd/f7fbc8_fcaffff35f3e4dbda14ef6503ce8d169.pdf
    • https://cdn.shopify.com/s/files/1/0431/2272/0922/files/wefujiveba.pdf
    • https://cdn.shopify.com/s/files/1/0434/1553/5774/files/the_word_exchange_anglo_saxon_poems_in_translation.pdf
    • https://cdn.shopify.com/s/files/1/0429/8801/1673/files/kakutamik.pdf
    • https://cdn.shopify.com/s/files/1/0431/4087/4408/files/lalonobofazukugomezojugez.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0078/files/limonomebaxilof.pdf
    • https://cdn.shopify.com/s/files/1/0439/6810/2558/files/2014_army_navy_game_uniforms.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad908162b8fe44ed80bf2d3668d8be69.pdf
    • https://static.usrfiles.com/ugd/b8c837_cec04c638e034c9bb057eca5ea089791.pdf
    • https://static.usrfiles.com/ugd/b8c837_bbd1deefe7a54f4dbca983e56ddde0bd.pdf
    • https://static.usrfiles.com/ugd/b8c837_61b3d792c6924598b05474a1d9757e8c.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_off00005042.bin
aee410a0cfccedc9ea5a2b1d1cbb1ec8fec5e736c260c9eade98969e495d14a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5042 5268 bytes
font_01_sfnt_off00006222.bin
a1906e70fa1eb315bd50ab9375596c6362b4d4285866ff9ebd0d750b93cd3f49
pdf-font-stream PDF embedded font (sfnt) at offset 0x6222 10176 bytes