Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d9e2cda7ef356c4…

MALICIOUS

PDF

44.8 KB Created: 2020-08-18 16:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc54ca297b68a81406091ab4e9aa2f94 SHA-1: 865131dfca7373db3834a09e39f4c1bdad0ff805 SHA-256: 7d9e2cda7ef356c49eaed01e85232f2a4c30f1088be7438289ffac663d17991a
220 Risk Score

Malware Insights

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

The PDF contains an embedded script payload and links to known malicious redirector infrastructure. The document body is heavily obfuscated but contains a URL that appears to be part of a link farm designed to manipulate search engine results. The presence of a PDF_SEO_LINK_FARM heuristic firing indicates the document's primary purpose is to host a large number of external links, likely for SEO manipulation or to distribute malicious content. The embedded script and the malicious redirector link suggest a multi-stage attack.

Heuristics 6

  • 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.
  • Embedded script payload in PDF stream high PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain script execution markers such as ActiveXObject/CreateObject, WScript.Shell, PowerShell, or shell-exec primitives. This is stronger than ordinary PDF JavaScript because it indicates a staged external script payload hidden in stream bytes.
  • Visible LOLBin command execution instruction high SE_LOLBIN_RUN_COMMAND
    Document contains instructions or visible command text involving Windows script/execution tools such as PowerShell, mshta, cmd, rundll32, or regsvr32
  • Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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=song+for+aerobic+exercise
    • http://gewolini.montanahorsesandmules.com/uploads/1/3/1/8/131856427/xabowuzen-temigag.pdf
    • http://files.debbiecordeiro.com/uploads/1/3/1/4/131483153/e03a99.pdf
    • http://zuzikofi.mindfulfootprint.com/uploads/1/3/1/0/131070240/kinuwi_biwowojej_samudim_futur.pdf
    • http://files.friendsofhuggins.org/uploads/1/3/1/0/131070581/deperatonoru.pdf
    • https://cdn.shopify.com/s/files/1/0429/3810/6023/files/17486818575.pdf
    • https://cdn.shopify.com/s/files/1/0437/6566/1853/files/delete_file_powershell.pdf
    • https://cdn.shopify.com/s/files/1/0434/0462/4021/files/49453869924.pdf
    • https://cdn.shopify.com/s/files/1/0438/0193/6033/files/fenikepakisodaxe.pdf
    • https://cdn.shopify.com/s/files/1/0434/6478/6086/files/wefutijisadedovunawodez.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/stick_ranger_2.pdf
    • https://cdn.shopify.com/s/files/1/0431/6725/2641/files/pibidafiwovojisewuluxubun.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9461/files/15105786078.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
embedded_pdf_script_000027f9.bin
a84c9c11c7dba04da03015f75c8276dff6bf846503adc576a480b7511efa4d88		 pdf-embedded-script PDF decompressed stream script payload at offset 0x27F9 45825 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s).
font_00_sfnt_off00006fc4.bin
6274b4d5e2d3c1a83198ba2ad462e96c7cb342fc3431116e4d8fdfdf7ac762c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FC4 5328 bytes
font_01_sfnt_off000081f4.bin
23cb14a7c1d19c4acb891d38af6f393369c4a74781f2228ec54e50e346db70a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81F4 10732 bytes

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