Malicious PDF — malware analysis report

Static analysis result for SHA-256 112747658f499fc7…

MALICIOUS

PDF

38.5 KB Created: 2020-08-30 11:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 832e08d2db28db04fb016596e1262b62 SHA-1: fa3a60a98b4173c3834c6331cadcb41778541e1e SHA-256: 112747658f499fc780476a974a68924207463e6f4b12bcfd042f4212be0b35d4
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to trick users into clicking it. The presence of numerous links points to a link farm or SEO poisoning tactic to distribute malicious content.

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=amonstar+sheep+shears
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3201/9097/files/dojupate.pdf
    • https://cdn.shopify.com/s/files/1/0431/2177/0657/files/wacom_tablet_driver_not_responding.pdf
    • https://cdn.shopify.com/s/files/1/0437/7713/0658/files/david_g_myers_psychology_11th_editio.pdf
    • https://cdn.shopify.com/s/files/1/0462/2444/1498/files/50002093387.pdf
    • https://static.usrfiles.com/ugd/b8c837_4eaf8e5298f744ff9c4905eb23437292.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7453fe166aa421cb9a6576793c7d090.pdf
    • https://static.usrfiles.com/ugd/b8c837_f66acebd9c5a44d2b41c188da780c883.pdf
    • https://static.usrfiles.com/ugd/9b33c5_3387826a4b3e4dc293b16a6bb2a50e46.pdf
    • https://static.usrfiles.com/ugd/de65f7_e6e97bfe41ba4c3b95e189a0fe5cd7f3.pdf
    • https://static.usrfiles.com/ugd/b8c837_98a330be0f8a412cbd134df2c0a42fea.pdf
    • https://static.usrfiles.com/ugd/b8c837_99ad1b897190417794d4720556388221.pdf
    • https://static.usrfiles.com/ugd/b8c837_b1af31325dd04060929ca47486efe374.pdf
    • https://static.usrfiles.com/ugd/b8c837_d889520d68334d968f4b813a1fe3d761.pdf
    • https://static.usrfiles.com/ugd/97493d_edb2d35b50c64882a20b74a268042add.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_off00005883.bin
98c2f021000ba693ec3d72c9809e8127e149881d68c35b0747859c6f01d99b1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5883 5016 bytes
font_01_sfnt_off00006960.bin
1356ab2f0f9b2788744a968f8fbf95fc2758e2a86d3a7a4decfd15cf1ae18a44
pdf-font-stream PDF embedded font (sfnt) at offset 0x6960 10580 bytes