Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b0c1f757277a5e0…

MALICIOUS

PDF

42.5 KB Created: 2020-08-31 09:40:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9be6e6fabddc68159882fb83604d04a2 SHA-1: 611f4bd0346d567b9733e8ddd4362481d386c6fd SHA-256: 1b0c1f757277a5e04d181d4fbfb4aecebffdfbf1cf77a45dac223006dddfdffb
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to downloading a microphone driver, and the PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm for SEO poisoning. The SE_DOWNLOAD_BUTTON heuristic further supports the lure of a download. The primary IOC is the redirector URL, which is likely used to serve further malicious content.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ru/wix?keyword=bm+800+microphone+driver+download
    • https://static.usrfiles.com/ugd/b8c837_83b9462286874da28ee99fd604e281d4.pdf
    • https://static.usrfiles.com/ugd/3aee12_ebdac348927041548dc497efd8428112.pdf
    • https://static.usrfiles.com/ugd/de60da_98786d48d5594e06a38825ffdb8e5916.pdf
    • https://static.usrfiles.com/ugd/d7ba0f_dd43d5d8ea374b0395524d2f0373347d.pdf
    • https://static.usrfiles.com/ugd/60933b_2e30d4f3f4e24db8afb40041a64234f2.pdf
    • https://static.usrfiles.com/ugd/f0e51d_9d0a8aec2d334c7bafda64a61bf63ec9.pdf
    • https://static.usrfiles.com/ugd/2f8cea_c5753b0b12e444e8916ea3cce14e26ae.pdf
    • https://static.usrfiles.com/ugd/08fe48_8cb79a94b41045f7807bfe4f41cf24b8.pdf
    • https://static.usrfiles.com/ugd/b8c837_755704f540af4d7bb0e46674b279632e.pdf
    • https://static.usrfiles.com/ugd/39cb9d_a6d99dcb8dae4c0eb3f226d36601e217.pdf
    • https://cdn.shopify.com/s/files/1/0433/9869/3013/files/bradford_protein_assay_protocol.pdf
    • https://cdn.shopify.com/s/files/1/0432/9930/7673/files/fomorifofewavow.pdf
    • https://cdn.shopify.com/s/files/1/0437/0006/0310/files/screen_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/9928/2845/files/thomas_and_friends_theme_song.pdf
    • https://cdn.shopify.com/s/files/1/0438/3378/6525/files/good_food_guide_2020_awards.pdf
    • https://cdn.shopify.com/s/files/1/0437/7231/3751/files/scanned_to_word_ocr.pdf
    • https://cdn.shopify.com/s/files/1/0435/4736/1439/files/ashrae_handbook_refrigeration_systems_and_applications.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005956.bin
ac61a56aa0550ec24cf69f4424f82d07033f584a9dbf9758035cf2eb38ed79cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5956 5380 bytes
font_01_sfnt_off00006b6d.bin
7dfe919ee0978d47c53282eaaf02b9d8b642762a3c6997bab23ee72fc012b921		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B6D 10288 bytes
font_02_sfnt_off00008eae.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EAE 4324 bytes

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