Malicious PDF — malware analysis report

Static analysis result for SHA-256 4203585e8804a0d2…

MALICIOUS

PDF

45.5 KB Created: 2020-08-29 07:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c67fdb5b91e1fb41661e34326eff205 SHA-1: 4e04c7341cfb73dc5a27b2550b2b12b0cf7ca478 SHA-256: 4203585e8804a0d24bc40b626687203d104be64f9229b8f1d538a8665ab4e03b
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=roland+barthes+mythologies+meaning'. Additionally, a PDF link farm heuristic indicates the presence of numerous external links, with the first being 'https://static.usrfiles.com/ugd/b8c837_38708ea07c0845c2a202dda7ae14a2e3.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be corrupted or obfuscated, but the embedded URL is clearly visible and is the primary indicator of malicious intent.

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=roland+barthes+mythologies+meaning
    • https://static.usrfiles.com/ugd/b8c837_38708ea07c0845c2a202dda7ae14a2e3.pdf
    • https://static.usrfiles.com/ugd/b8c837_05ccfb6f509347ac986093d5b86f1f3d.pdf
    • https://static.usrfiles.com/ugd/b8c837_9586012e658f4a18b04395e18214053e.pdf
    • https://cdn.shopify.com/s/files/1/0439/9936/3222/files/37337642248.pdf
    • https://cdn.shopify.com/s/files/1/0434/1766/5703/files/xomufunazu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1236/6229/files/dafalosezuwavivaxezexa.pdf
    • https://cdn.shopify.com/s/files/1/0430/0963/8553/files/99538293941.pdf
    • https://cdn.shopify.com/s/files/1/0435/5653/6471/files/figotukulewizovojuwejelul.pdf
    • https://cdn.shopify.com/s/files/1/0435/2193/3466/files/fewurote.pdf
    • https://cdn.shopify.com/s/files/1/0428/2191/0687/files/30817763093.pdf
    • https://cdn.shopify.com/s/files/1/0437/6566/1853/files/kevin_gates_excuse_me_download.pdf
    • https://cdn.shopify.com/s/files/1/0441/2047/3752/files/lepelafexodim.pdf
    • https://cdn.shopify.com/s/files/1/0429/7015/3113/files/88804406928.pdf
    • https://cdn.shopify.com/s/files/1/0433/0445/2246/files/zopoditex.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/
    • https://cdn.shopify.com/s/files/1/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073e3.bin
b2f13d58c48350912aeb32c496399fdac2b592affd5eb66303d5606f59af416e
pdf-font-stream PDF embedded font (sfnt) at offset 0x73E3 5488 bytes
font_01_sfnt_off00008667.bin
e477693eef2bc1f2b255279561128ec50a53657c0ce68de29409877a00251406
pdf-font-stream PDF embedded font (sfnt) at offset 0x8667 10140 bytes