Malicious PDF — malware analysis report

Static analysis result for SHA-256 71660d56a9d635e2…

MALICIOUS

PDF

35.7 KB Created: 2020-09-06 00:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 128a8f7ac2d53accdb263e3bf59a1d65 SHA-1: bbd1ca55b919010f14ceb6a7444627cc445cc8de SHA-256: 71660d56a9d635e204cacdeb4893a1e849c7af88fc661b4e02dad99b6a4f195b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.club'. The document body also contains this URL, suggesting it's intended to be clicked. Additionally, a PDF link farm heuristic indicates the document is designed to host numerous external links, likely for SEO manipulation or to distribute malicious content. 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.club/pify?keyword=reported+speech+questions+and+answers+exercises
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0441/2522/5112/files/gamazidananavi.pdf
    • https://cdn.shopify.com/s/files/1/0461/7266/8057/files/grandstream_gxp2160_quick_user_guide.pdf
    • https://cdn.shopify.com/s/files/1/0436/8557/6857/files/linux_commands_with_examples_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/8043/3302/files/fundamentals_of_seismic_tomography.pdf
    • https://static.usrfiles.com/ugd/79e0dc_c63ec59255fa479cbe1bb54219fa7091.pdf
    • https://static.usrfiles.com/ugd/b8c837_a406e4a95a05465a9de242793e226551.pdf
    • https://static.usrfiles.com/ugd/595093_5a048ff44add453c95f10e984341e0f2.pdf
    • https://static.usrfiles.com/ugd/2074c9_b8bddaa5d3cc4567865ba4cb83b6063b.pdf
    • https://static.usrfiles.com/ugd/7f46b5_e1dff3fc4f034fe99d556d259bf14651.pdf
    • https://static.usrfiles.com/ugd/a2e20a_5ce8acba89b946c5943ef163cff5b806.pdf
    • https://static.usrfiles.com/ugd/2b3f46_92e1641fc56a4d1cbe75007dd5e2b7e4.pdf
    • https://static.usrfiles.com/ugd/564d2e_cb045e8c45d84143a1fef2ef3e489bdf.pdf
    • https://static.usrfiles.com/ugd/f17c08_f3db6d5e93a342b9838f81a607d1b6f2.pdf
    • https://static.usrfiles.com/ugd/8ba634_3fc75a7adfdb449ba6753b174dfe44cd.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_off00004d0c.bin
bbf77eaf64fd66cb3e850437c03c9173bb47e1c1dcad828023843fbf6bf45026
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D0C 5424 bytes
font_01_sfnt_off00005f94.bin
a15efbe2aceab9c6372a6ca2bdc7b92a769ccc6ee1b9c4ffcf01e22e35c85057
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F94 10020 bytes