Malicious PDF — malware analysis report

Static analysis result for SHA-256 d525b2b7b256d760…

MALICIOUS

PDF

55.3 KB Created: 2020-08-31 16:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f6677a8eaf1b656ffd3613c774e2142 SHA-1: 18601b317b2ebc126634ee57d1a993cda3053f50 SHA-256: d525b2b7b256d7606beac79b5f53d593b645f71c9ee17db6c78d7ec9489f5aec
152 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text that appears to be a lure for an instruction manual. The ML classifier also strongly indicated maliciousness. The primary IOC is the redirector URL used to funnel victims to the next stage of the attack.

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=boxford+lathe+instruction+manual
    • https://static.usrfiles.com/ugd/3649d2_8fa9fde143534c02b6db7c69e6ad9c9c.pdf
    • https://static.usrfiles.com/ugd/fd3290_3bff5a7251464132ad3dde2adb200ea5.pdf
    • https://static.usrfiles.com/ugd/cfbfd2_157738ccea764cd784ffd13f1f7707f3.pdf
    • https://static.usrfiles.com/ugd/ea9bdf_f6ebe974988e416a834d85401f043f09.pdf
    • https://static.usrfiles.com/ugd/b8c837_83ed7fecf43645cf9dda821df40c48f0.pdf
    • https://static.usrfiles.com/ugd/79e0dc_f676d1a5a68a4101afb93ee8a1d3f36d.pdf
    • https://static.usrfiles.com/ugd/defcb2_ec369ce2e4b6489fa88c49f864f95441.pdf
    • https://static.usrfiles.com/ugd/b8c837_b549305a9099462bad9dae07b5a0bec4.pdf
    • https://static.usrfiles.com/ugd/b85eb0_2dffb60f3cef44d5898e5e4ecd3478fd.pdf
    • https://static.usrfiles.com/ugd/b8c837_1aa57594e02e441ea95b5da593fdcb4f.pdf
    • https://static.usrfiles.com/ugd/a2d007_90396f798bb446079ad3135aaab5595c.pdf
    • https://static.usrfiles.com/ugd/d5415a_5cb81c5490af4e45a148a4f87b10edc5.pdf
    • https://static.usrfiles.com/ugd/4b68be_70fe3d55c2354087a2318101a792cc20.pdf
    • https://static.usrfiles.com/ugd/b8c837_bad4b69883224d7d8273a374c929be27.pdf
    • https://static.usrfiles.com/ugd/50c35f_e2a3a322312040da995346d3b66ebfd9.pdf
    • https://static.usrfiles.com/ugd/7d21c0_450cc76549f14001ab45f9f5bc3124f7.pdf
    • https://static.usrfiles.com/ugd/451a43_c13b97615ae04081b0881a73535c6827.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_off00009b5a.bin
27455b0892436bd47a8b3e3f28bb4427c13d27a6d67f4a601cb34f0d09ca8794
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B5A 5380 bytes
font_01_sfnt_off0000ad81.bin
761981c9a405ae6579fabdc9f22bb1cb91c891d9cfbb35e0c02fa5ffdccbd0fe
pdf-font-stream PDF embedded font (sfnt) at offset 0xAD81 10416 bytes