Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb14630da87b0ec3…

MALICIOUS

PDF

46.4 KB Created: 2020-09-05 10:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28ae2f2cdd300078ee1de3aba683049e SHA-1: 8188f1d0845e07f1a6aed34ba2e0adbf9279d39a SHA-256: cb14630da87b0ec31efee44036233dac34dfdf44e4f3c72472995aac4ef02ff7
154 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.club/wix?keyword=printable+layers+of+the+atmosphere+worksheets', which is also listed as a malicious redirector. Additionally, the PDF exhibits characteristics of a link farm, embedding numerous external links, with 'https://static.usrfiles.com/ugd/2b3f46_9fc15fc34428444d9e38faaab0861363.pdf' being the first in this list.

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/wix?keyword=printable+layers+of+the+atmosphere+worksheets
    • https://static.usrfiles.com/ugd/2b3f46_9fc15fc34428444d9e38faaab0861363.pdf
    • https://static.usrfiles.com/ugd/9421c8_4c4dedbc024c47e0b05e7c18127ef78f.pdf
    • https://static.usrfiles.com/ugd/b8c837_52cc22bbb8c04c398fb28627c88c81bb.pdf
    • https://static.usrfiles.com/ugd/b8c837_6d8407c9959e4ee9ae53b1189bb69f36.pdf
    • https://static.usrfiles.com/ugd/8da65f_efa394971a3a400b97f6686a19023249.pdf
    • https://static.usrfiles.com/ugd/b8c837_d21579b3702248fe8052b3cb6aa524ed.pdf
    • https://static.usrfiles.com/ugd/7f614e_1522de58b27e43bd98b2c42aa3e110a6.pdf
    • https://static.usrfiles.com/ugd/f0f215_9eccbc5de88e425da6bc3d816a46c78f.pdf
    • https://cdn.shopify.com/s/files/1/0436/9013/1609/files/guardians_of_the_galaxy_2008_team.pdf
    • https://cdn.shopify.com/s/files/1/0434/5357/9430/files/39774264452.pdf
    • https://cdn.shopify.com/s/files/1/0447/9975/4397/files/administration_of_justice_and_judicial_process.pdf
    • https://cdn.shopify.com/s/files/1/0438/1884/4322/files/reflector_2_download_crack_mac.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zijuk.pdf
    • https://cdn.shopify.com/s/files/1/0448/1295/9905/files/jexokewu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/74731072541.pdf
    • https://cdn.shopify.com/s/files/1/0437/4121/6919/files/49663442976.pdf
    • https://cdn.shopify.com/s/files/1/0433/9469/5329/files/dexogunegufokerewoz.pdf
    • https://cdn.shopify.com/s/files/1/0440/4533/6726/files/faxakugorolininovitiro.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_off000072d9.bin
462817431e2aac7f5f171c45e0dbd7112b183c047e33b12c02fa369c3a118630		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72D9 5540 bytes
font_01_sfnt_off00008595.bin
ddf780c27a516ad4388918a514803faf4642125761985752e1bf260e9cfadbee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8595 11196 bytes

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