Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d11b38496fd1f4…

MALICIOUS

PDF

66.7 KB Created: 2020-08-07 17:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebec1849b0bf11d854d613f7d007289b SHA-1: e10a6943157d6ff0c09f03e37d6f2514177a7f5f SHA-256: 98d11b38496fd1f483226f2fbbbf4b49edbf8df8228fe7614d5e048690358805
170 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded JavaScript and multiple links, including one to a known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=arm+cortex+m3+programming+pdf'. The document body also contains text that appears to be a lure for the URL. Additionally, a heuristic indicates a 'Clipboard command execution lure', suggesting the document may instruct the user to copy and paste commands into a shell. The presence of embedded JS and the malicious redirector link strongly suggest an attempt to deliver a second-stage payload.

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
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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/pify?keyword=arm+cortex+m3+programming+pdf
    • http://files.abridgetoenglish.com/uploads/1/3/0/7/130775361/vuwujiga-riwujaka-widuge.pdf
    • http://files.eyeslikemineinc.org/uploads/1/3/0/9/130969238/rilijuxeg-pagovotodemizet.pdf
    • http://files.sarahbrothersbot.com/uploads/1/3/0/8/130873728/zipukapudak.pdf
    • https://cdn.shopify.com/s/files/1/0435/2186/7930/files/57094504732.pdf
    • https://cdn.shopify.com/s/files/1/0434/5308/7901/files/buffer_solution_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0436/4288/0160/files/xobibusixu.pdf
    • https://cdn.shopify.com/s/files/1/0439/1773/8152/files/42275422211.pdf
    • https://cdn.shopify.com/s/files/1/0427/6686/0455/files/nomikoranudikalovadekof.pdf
    • https://cdn.shopify.com/s/files/1/0431/2412/9952/files/wunuwiwafufefag.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/46238931704.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57955619809.pdf
    • https://cdn.shopify.com/s/files/1/0440/1859/8038/files/31125238222.pdf
    • https://cdn.shopify.com/s/files/1/0431/2317/9677/files/7033773404.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/43639534019.pdf
    • https://cdn.shopify.com/s/files/1/0432/9340/9438/files/xuvapebopixobifidetawi.pdf
    • https://cdn.shopify.com/s/files/1/0429/1022/0447/files/74858045282.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_off0000ac5e.bin
3d853f5e8e40ab0f52e73e95569ce090ca115701676fa088e1803816f4ff946a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC5E 5276 bytes
font_01_sfnt_off0000be32.bin
5807602b90a1cbda6e901d3c6d810ac7e44489a17ceee1909d2dc27ff7f2abb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE32 15728 bytes
font_02_sfnt_off0000ef54.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF54 4324 bytes

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