Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe8eb160d4a2372…

MALICIOUS

PDF

50.3 KB Created: 2020-08-05 17:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 292c02a285245a41a0c7f2aba2d21990 SHA-1: 7cab8920d8e3d4d4757d9b6f6f8421ca521836b5 SHA-256: efe8eb160d4a2372adbed3f3945c6a0c188fac442c26c6ac9d0d393d8a4a051d
130 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to `https://ttraff.cc/pify?keyword=resignation+letter+format+with+notice+period+pdf`. This URL is presented within the document body, disguised as a resignation letter. The document also contains a link farm heuristic, with many links pointing to Shopify-hosted PDFs, one of which is `https://cdn.shopify.com/s/files/1/0428/6929/3223/files/53386586383.pdf`. The presence of a visual download button lure further supports a malicious intent to trick the user into clicking the malicious link.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=resignation+letter+format+with+notice+period+pdf
    • http://files.lizromanek.com/uploads/1/3/1/1/131164204/senit-baxalibowex-vumox-xifivegokokopo.pdf
    • http://files.deliriumcarenetwork.com/uploads/1/3/1/4/131407194/3125143.pdf
    • http://files.thejuraguy.com/uploads/1/3/1/4/131406036/wejevanora.pdf
    • http://files.zopaart.com/uploads/1/3/0/9/130969717/reguviz-pojek.pdf
    • https://cdn.shopify.com/s/files/1/0428/6929/3223/files/53386586383.pdf
    • https://cdn.shopify.com/s/files/1/0434/8759/2608/files/88861181532.pdf
    • https://cdn.shopify.com/s/files/1/0434/4869/6993/files/friday_the_13th_part_3_cast.pdf
    • https://cdn.shopify.com/s/files/1/0431/2943/8370/files/44076434267.pdf
    • https://cdn.shopify.com/s/files/1/0433/6710/4668/files/vovujewiweledofaremumas.pdf
    • https://cdn.shopify.com/s/files/1/0434/6285/2773/files/48520950993.pdf
    • https://cdn.shopify.com/s/files/1/0431/5496/4631/files/nivufumabunujemuxigetapa.pdf
    • https://cdn.shopify.com/s/files/1/0429/9862/8501/files/45023380193.pdf
    • https://cdn.shopify.com/s/files/1/0428/8859/3567/files/68322335011.pdf
    • https://cdn.shopify.com/s/files/1/0436/4409/2566/files/8461109611.pdf
    • https://cdn.shopify.com/s/files/1/0430/3798/2869/files/795738514.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_off00007972.bin
d5e685e7e16e5df4aafcd9052be8468527e0f92a0e2a2c23beaf0798ad5f0aab
pdf-font-stream PDF embedded font (sfnt) at offset 0x7972 5456 bytes
font_01_sfnt_off00008bdf.bin
e731f8fcba96aff988d424b7d6c4597f97faf610ce99f42dc54f81310c863ba0
pdf-font-stream PDF embedded font (sfnt) at offset 0x8BDF 9912 bytes
font_02_sfnt_off0000add5.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xADD5 4324 bytes