Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e45c41b64eca90…

MALICIOUS

PDF

40.0 KB Created: 2020-08-31 10:39:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e67c354563821c8b2dceb89742ae497 SHA-1: d94804931465f77079b4454f76b68db756341bc4 SHA-256: 61e45c41b64eca900e3ea235e7ba43e65d8f641e0d98a5dfe23992980c5ad848
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, ttraff.cc, which is likely used to obscure the final destination of the malicious content. The document body, though heavily obfuscated, contains text related to 'The Purge' and the malicious URL, suggesting a lure to entice users to click. The presence of numerous external PDF links, many pointing to benign content, suggests a link farm or SEO poisoning tactic to improve the ranking of the malicious link.

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+purge+season+1+episode+3
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_c17d130facb3441690e2030855741e61.pdf
    • https://static.usrfiles.com/ugd/8127dd_43f12a3b653b43ec9c9a0589d5535ef8.pdf
    • https://static.usrfiles.com/ugd/b8c837_19264833cbd04ddc9aec8a20a8d52c93.pdf
    • https://static.usrfiles.com/ugd/d17951_206895dc51c543b7948d39792daa394e.pdf
    • https://cdn.shopify.com/s/files/1/0432/2384/2983/files/51303776295.pdf
    • https://cdn.shopify.com/s/files/1/0435/2629/1611/files/free_html5_website_templates_for_business.pdf
    • https://static.usrfiles.com/ugd/8ab72e_e021070cf8b147c58197710ffa4eda99.pdf
    • https://static.usrfiles.com/ugd/e23fbb_16e3f04a920a4942bf02ce181aba4dcf.pdf
    • https://static.usrfiles.com/ugd/d2751c_164544551bd148d19c642ae95569adca.pdf
    • https://cdn.shopify.com/s/files/1/0432/6726/0576/files/application_letter_for_any_position_format.pdf
    • https://cdn.shopify.com/s/files/1/0430/6193/6285/files/62481446436.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_off00005f16.bin
866ea951059885873c5d726891938524677628986eed86becf3264422e59ca84
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F16 5352 bytes
font_01_sfnt_off00007147.bin
7efaf6fd49fce66ed95288458250e31918dd3211e4f28f6c2f57fa7fee525c78
pdf-font-stream PDF embedded font (sfnt) at offset 0x7147 10128 bytes