Malicious PDF — malware analysis report

Static analysis result for SHA-256 b241451499d42409…

MALICIOUS

PDF

42.1 KB Created: 2020-08-31 09:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcf4f4efdf7797585927140995f7673d SHA-1: 14648b56d835e4c9fad53e7864cb7fb8933738dd SHA-256: b241451499d42409e5f3670a937f4c05ebec22dc43b6799b2eb23b74a906498f
152 Risk Score

Malware Insights

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

This PDF document contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL https://ttraff.com/wix?keyword=polska+szkola+w+naperville, which is flagged as malicious. The presence of a large number of external PDF links, many hosted on static.usrfiles.com, suggests a link farm or SEO poisoning attempt to drive traffic to malicious sites. The ML classifier also strongly indicated maliciousness.

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.com/wix?keyword=polska+szkola+w+naperville
    • https://static.usrfiles.com/ugd/dfb5f8_a2a0a96dc0b640dcbf897dcf3e97457b.pdf
    • https://static.usrfiles.com/ugd/b8c837_1dfe8f8888b8491f80ea938412e789d6.pdf
    • https://static.usrfiles.com/ugd/a2ebd8_45dec6b753e1426ebb1539b65a6ffa82.pdf
    • https://static.usrfiles.com/ugd/74c34a_789ebfcd3c26468b9ab804c844b42847.pdf
    • https://cdn.shopify.com/s/files/1/0446/9293/0716/files/83684610054.pdf
    • https://static.usrfiles.com/ugd/b8c837_4683a8403b6544a59354e75a341770f1.pdf
    • https://static.usrfiles.com/ugd/1f2646_6978a04f03714b128b62c5f32b41ce23.pdf
    • https://cdn.shopify.com/s/files/1/0435/9208/9759/files/garijovafekopit.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/figativojolosekelileditu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4117/7252/files/pagukuruwozi.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_off000060cb.bin
e4878ec7cc98d9fc2100ebc1c39aecc044596f44f0ec44d5cec453c5d28d35f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60CB 5080 bytes
font_01_sfnt_off00007240.bin
ff7bc11e5901fc778aaf5d0219b971474303392279fe74a381f28792aaea3d4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7240 12764 bytes

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