Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce26ead163af3eab…

MALICIOUS

PDF

46.3 KB Created: 2020-08-31 02:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6a8ae39cd3e86be8bd53ab5bb3c8f04 SHA-1: 5d7a649889579f0293efe0d0465804061008c204 SHA-256: ce26ead163af3eab5b32d92234295fe301eddf5b984934492f57fc994fa4ee66
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify and static.usrfiles.com, suggesting an attempt at SEO poisoning or link farming. One critical heuristic identified a link to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains references to 'Gold's gym power flex exercises' and the malicious redirector URL, indicating a lure to a potentially harmful site. The ML classifier strongly flagged this PDF as malicious.

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.com/wix?keyword=gold%2527s+gym+power+flex+exercises
    • https://cdn.shopify.com/s/files/1/0437/6700/5333/files/daarck_arapa_t.pdf
    • https://cdn.shopify.com/s/files/1/0430/9542/5191/files/mejowunexerelogawelamoxi.pdf
    • https://cdn.shopify.com/s/files/1/0438/8900/0616/files/4th_grade_math_challenge_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0446/7798/8505/files/blogging_business_plan.pdf
    • https://cdn.shopify.com/s/files/1/0436/5769/1289/files/simplified_chinese_alphabet.pdf
    • https://static.usrfiles.com/ugd/b8c837_70eb3797cd96432382bee261fb3a4c4d.pdf
    • https://static.usrfiles.com/ugd/b8c837_7df349b8dad545d58ed9b50e11a55cc5.pdf
    • https://static.usrfiles.com/ugd/e3c460_16e8a7a696764160a08ebc81e460a6ae.pdf
    • https://static.usrfiles.com/ugd/b8c837_077801986ce341a8858c1d3b0c43f43f.pdf
    • https://static.usrfiles.com/ugd/a64c8c_b472e6411991431296445b067a82177b.pdf
    • https://static.usrfiles.com/ugd/34e21e_ed8dba23881649d0bf99f107052a52e6.pdf
    • https://static.usrfiles.com/ugd/599026_aa947972605848138d5c25092374404d.pdf
    • https://static.usrfiles.com/ugd/4dd980_032a30fdc8c3413da3d45a70552539e7.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005de7.bin
bf9d564df6d98d276a197aea03e66cf007463be569dfac296f0903f7e2a3b4c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE7 5192 bytes
font_01_sfnt_off00006fbb.bin
fd8c81e59394452f80ff413ed204a7f0d563edc43135c76a0a10bb211e637f67
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FBB 15568 bytes
font_02_sfnt_off00009e59.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E59 4324 bytes