Malicious PDF — malware analysis report

Static analysis result for SHA-256 a814044acad9ca38…

MALICIOUS

PDF

34.9 KB Created: 2020-08-30 09:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2442ee84977f49eb7779edb33ddce156 SHA-1: 5a904025eef9e580f189428f61c935d5b4363433 SHA-256: a814044acad9ca38ed4a2afb5267d3fd7c9464056c78a5fc9c4c4550605b4744
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=phet+simulation+bending+light'. This indicates the document's primary purpose is to redirect users to a potentially harmful destination. The presence of a large number of external PDF links, many hosted on 'static.usrfiles.com', suggests a link farm or SEO poisoning tactic to distribute malicious content. No scripts were extracted, but 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.cc/wix?keyword=phet+simulation+bending+light
    • https://static.usrfiles.com/ugd/97aff7_17180b25ee13421ca834bf5ee1860503.pdf
    • https://static.usrfiles.com/ugd/97368a_df1e4de3d5a74303ad6bb42f75044bb5.pdf
    • https://static.usrfiles.com/ugd/b8c837_c5751e6bda844f2b8fa809d0d9be069e.pdf
    • https://static.usrfiles.com/ugd/1849a1_4ef02a53836d490f98b08d230362cac5.pdf
    • https://cdn.shopify.com/s/files/1/0438/1681/2706/files/icarly_iparty_with_victorious.pdf
    • https://cdn.shopify.com/s/files/1/0440/0391/7974/files/contacto_carl_sagan_libro.pdf
    • https://cdn.shopify.com/s/files/1/0437/2316/1768/files/foot_ball_players_wallpapers.pdf
    • https://static.usrfiles.com/ugd/d775a9_05960dd51a104bf99769cf7ba56f1954.pdf
    • https://static.usrfiles.com/ugd/e3ff21_f1b65203cee047c5ad5418aded495b91.pdf
    • https://static.usrfiles.com/ugd/a48928_ffa88c6b347647008beb3ec04acf1408.pdf
    • https://static.usrfiles.com/ugd/2c8d66_f02912ce02454bae9f952e4b44b8ad96.pdf
    • https://static.usrfiles.com/ugd/b80405_d3c6f2363df94077912934781c01164b.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_off00004a1b.bin
116f67b8a5a01baf3632872bb10360f3d5070f3a49b3c3dd257ff8b62fc69906
pdf-font-stream PDF embedded font (sfnt) at offset 0x4A1B 5284 bytes
font_01_sfnt_off00005bed.bin
928eecb7e3672d2ccfcf31745aa45f7fa373c9d58a3f312d298901c3db83bbdf
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BED 10244 bytes