Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ec5f538cf682cb…

MALICIOUS

PDF

45.3 KB Created: 2020-08-11 01:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43e5071db2dee606c27a5335611fbd6f SHA-1: 6b8ae03ebc7a056b1232dd1da6daefa2bcc3c936 SHA-256: 27ec5f538cf682cb6324ed20eab4d8fdb6a0fdb0e9f7d69fd679bd8d98533175
120 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector link. The embedded URL points to a redirector that uses a keyword-based URL structure, likely to appear as a legitimate search result for 'sales negotiation skills pdf'. The document body contains obfuscated text and a URL that is also present in the heuristics, confirming the redirection attempt.

Heuristics 3

  • 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 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=sales+negotiation+skills+pdf
    • http://files.sandrapaolalopez.com/uploads/1/3/0/8/130813851/b7389bf85b399a3.pdf
    • http://vukowiji.csgsps.co.uk/uploads/1/3/0/7/130738614/loxunuligubu.pdf
    • http://files.doulacortney.com/uploads/1/3/2/8/132815008/770125.pdf
    • http://files.burkettbuilding.com/uploads/1/3/0/7/130776338/9819d7.pdf
    • https://cdn.shopify.com/s/files/1/0430/3847/4397/files/nufudav.pdf
    • https://cdn.shopify.com/s/files/1/0431/4326/6458/files/jupidufusugifelorug.pdf
    • https://cdn.shopify.com/s/files/1/0431/7505/1421/files/reproduction_in_amphibians.pdf
    • https://cdn.shopify.com/s/files/1/0432/2128/7080/files/54597375487.pdf
    • https://cdn.shopify.com/s/files/1/0435/9480/9507/files/kexulolaruja.pdf
    • https://cdn.shopify.com/s/files/1/0428/8937/9993/files/gorinusexatokapof.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/vumigivamufun.pdf
    • https://cdn.shopify.com/s/files/1/0438/3460/5730/files/canon_city_movies.pdf
    • https://cdn.shopify.com/s/files/1/0428/2961/1171/files/18370285034.pdf
    • https://cdn.shopify.com/s/files/1/0437/6638/2746/files/famuzaxukutiv.pdf
    • https://cdn.shopify.com/s/files/1/0432/5838/0446/files/agroecology_and_sustainable_food_systems.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_off00007299.bin
4f2de3529b0157f3c12a55f62063fd863bf3e70073e75f4bb3f9f6344a3e9bce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7299 5280 bytes
font_01_sfnt_off0000849f.bin
4b71035d69ec31c04bd95c837a85600ef82a952d0d688e1921e4ba86e82df055		 pdf-font-stream PDF embedded font (sfnt) at offset 0x849F 10456 bytes

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