Malicious PDF — malware analysis report

Static analysis result for SHA-256 be1f4f5efe1c152f…

MALICIOUS

PDF

45.0 KB Created: 2020-08-20 21:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1273d2602b77fc6170a678ecb7eaccfd SHA-1: 4fe9de270a378ae26e67d5da6f1eafd3b39362b0 SHA-256: be1f4f5efe1c152fae12919aebc23548aed7c41a7056472f5fdd9a5560d56baf
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The PDF also hosts a large number of external links, many of which are hosted on Shopify, suggesting a link farm for SEO manipulation. The ML classifier strongly flagged this PDF as malicious. The embedded URL points to a redirector that likely leads to a malicious payload.

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/pify?keyword=mathematics+syllabus+d+book+2+pdf
    • http://files.travelusamerica.com/uploads/1/3/2/8/132816202/jopefapetamifesis.pdf
    • http://pidoke.roxelpta.org/uploads/1/3/0/9/130969600/88a87b74081812.pdf
    • https://cdn.shopify.com/s/files/1/0433/6553/1806/files/menuwifij.pdf
    • https://cdn.shopify.com/s/files/1/0462/8722/4993/files/94882984381.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mefiwi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8717/5588/files/12725443190.pdf
    • https://cdn.shopify.com/s/files/1/0431/1747/8044/files/lajen.pdf
    • https://cdn.shopify.com/s/files/1/0431/8186/7176/files/97601246886.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/56263421097.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2836/files/49684229396.pdf
    • https://cdn.shopify.com/s/files/1/0433/9364/6753/files/1395428737.pdf
    • https://cdn.shopify.com/s/files/1/0433/0133/9304/files/sexoxureforajozejisiv.pdf
    • https://cdn.shopify.com/s/files/1/0429/7539/5993/files/59517366102.pdf
    • https://cdn.shopify.com/s/files/1/0427/8996/1884/files/fepumise.pdf
    • https://cdn.shopify.com/s/files/1/0438/1832/0029/files/wexupizut.pdf
    • https://cdn.shopify.com/s/files/1/0432/7853/2758/files/impacts_of_ecotourism.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_off00006432.bin
378e117c0ac7561389d1acbbbe48dff450796d4eebf9411d2a914aa8129c6607		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6432 5516 bytes
font_01_sfnt_off000076fd.bin
62f17847409c59220955d27c0ebe2dbd4fb5759d281cc710c81f22ffa2ed6951		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76FD 9852 bytes
font_02_sfnt_off000098b3.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98B3 4324 bytes

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