Malicious PDF — malware analysis report

Static analysis result for SHA-256 14d09ab0d59e7e86…

MALICIOUS

PDF

44.8 KB Created: 2020-08-13 00:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b3bcd78082a717db5093f765ca3b050 SHA-1: 5d48397071e40d3d29a2940060eeb8160df53fc5 SHA-256: 14d09ab0d59e7e86a1e887eb5258d3e7c8b11c8d345b2c59a0bb115627578936
194 Risk Score

Malware Insights

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

The PDF contains a lure instructing the user to copy and paste content into a shell, which is a common technique for executing malicious commands. It also contains numerous links to external PDFs, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to download and execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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/pify?keyword=learn+python+the+hard+way+python+3+pdf+zed+shaw
    • http://files.edmotivate.com/uploads/1/3/2/6/132681296/xuvageju.pdf
    • http://files.3lennons.com/uploads/1/3/0/7/130776573/wapus-ketunewidowed-vixizoz-nekavakofop.pdf
    • http://files.emilystillings.com/uploads/1/3/1/6/131606208/vapusake-nibajoxeke-siruxemozi-xusezoze.pdf
    • http://files.cailenfu.com/uploads/1/3/1/4/131437444/rutez_wubusaxofab_kajali_zuwogor.pdf
    • http://files.hectorhandmade.com/uploads/1/3/1/4/131414743/3423004.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5738/8437/files/dental_anatomy_coloring_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/8326/7236/files/22454186295.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/2997/files/kexoribinisalexawuxil.pdf
    • https://cdn.shopify.com/s/files/1/0438/9847/0552/files/bewafogu.pdf
    • https://cdn.shopify.com/s/files/1/0436/4750/0448/files/26681428935.pdf
    • https://cdn.shopify.com/s/files/1/0429/1916/6119/files/31448505602.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1563/files/57657674986.pdf
    • https://cdn.shopify.com/s/files/1/0432/0945/7825/files/13830774396.pdf
    • https://cdn.shopify.com/s/files/1/0428/7892/7014/files/waregasuku.pdf
    • https://cdn.shopify.com/s/files/1/0432/2797/1741/files/15606616849.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9880/files/xuwaxagijowimigevusakifid.pdf
    • https://cdn.shopify.com/s/files/1/0435/7983/4531/files/64023595392.pdf
    • https://cdn.shopify.com/s/files/1/0431/7013/6220/files/evil_tree_rs3.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30551251375.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068d2.bin
a338f68dc5bbefdb76124f0a7f98dc982da1165a501ea1d79bc4797fe770f92e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68D2 5444 bytes
font_01_sfnt_off00007b74.bin
7dde3097d2a9665b8d5eba39144e4c448c3673fa7b0271faa1274295bbe4f483		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B74 14824 bytes

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