Malicious PDF — malware analysis report

Static analysis result for SHA-256 a51de5688c61420f…

MALICIOUS

PDF

53.0 KB Created: 2020-08-31 12:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28b98901b7f84792ead5c978ff1aa8df SHA-1: 1d1c483579568294f55b1c8d3f57cebbc00a78b8 SHA-256: a51de5688c61420f23d2a1f4fc5d67c648210c5dbe21dfc724aefe670e1e0af4
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, disguised as a game guide. This indicates a phishing or scam attempt. The PDF also hosts a large number of external links, many pointing to shopify.com and static.usrfiles.com, suggesting a link farm for SEO manipulation or to obscure the malicious redirector. The ML classifier strongly supports the malicious verdict.

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=langrisser+mobile+lana+guide
    • https://cdn.shopify.com/s/files/1/0431/6109/2255/files/79446871074.pdf
    • https://cdn.shopify.com/s/files/1/0433/8984/5671/files/strings_mix_simple_java_solution.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jepomosojavadoji.pdf
    • https://cdn.shopify.com/s/files/1/0440/0414/7350/files/79368833403.pdf
    • https://static.usrfiles.com/ugd/724bd4_fd410ead2eaa43cc88efd7b6de31cf5d.pdf
    • https://static.usrfiles.com/ugd/b48b60_dccda61aa3824dae8c5ff0adcd3a2f6d.pdf
    • https://static.usrfiles.com/ugd/fa6f14_49419a8b1ce349e7938e7116dbf799bb.pdf
    • https://static.usrfiles.com/ugd/b8c837_82286ee8293442c8a336b04116693c48.pdf
    • https://static.usrfiles.com/ugd/ee9d3f_cc860d00d4fe406d9f53ccebfc4ffca4.pdf
    • https://static.usrfiles.com/ugd/b8c837_fb5060f414fa44a087299213ea30f6b9.pdf
    • https://static.usrfiles.com/ugd/4dd980_4df59e8070dd4cb0b2d7d5f82644de66.pdf
    • https://static.usrfiles.com/ugd/43d598_cfc752b6a02248839fca751f15dd3264.pdf
    • https://static.usrfiles.com/ugd/2b25b5_a64460ea25ce4b5fb0f38f0ea6d615c8.pdf
    • https://static.usrfiles.com/ugd/e2c250_7e98f43df26b4a6bb1f70c316bcceff6.pdf
    • https://static.usrfiles.com/ugd/3aee12_66720f02a6b848dd8c9cb092eb772052.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_off00009281.bin
64005191b365a4a3cf304deb34677cf5251589c87019f824943c718bfba6642e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9281 5228 bytes
font_01_sfnt_off0000a42d.bin
dcdbfc877f0344a6d79255bc351d7db7c7e803ed019bbb845cb5966f23972d09
pdf-font-stream PDF embedded font (sfnt) at offset 0xA42D 10140 bytes