Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91fb0232bbe02dc…

MALICIOUS

PDF

44.9 KB Created: 2020-08-30 12:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b510f2cba817544af69b6ab965dfff89 SHA-1: 769bb3b85cd5c2b90555a4c5a3a0762ed5299430 SHA-256: b91fb0232bbe02dc6ef5a4e713dc4a536e9dca9c0fc23c8598c049208bd8f7e9
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, with the primary one leading to a Shopify domain. The document body, though heavily obfuscated, contains text related to 'examen de matematicas primer grado p' and the wkhtmltopdf tool, suggesting a lure to disguise the malicious intent. The primary malicious URL is 'https://ttraff.com/wix?keyword=examen+de+matematicas+primer+grado+p'.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.com/wix?keyword=examen+de+matematicas+primer+grado+p
    • https://cdn.shopify.com/s/files/1/0434/6563/8050/files/simplesmente_acontece_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/0623/7604/files/71454933129.pdf
    • https://cdn.shopify.com/s/files/1/0434/0888/3870/files/29417603525.pdf
    • https://cdn.shopify.com/s/files/1/0434/4253/6598/files/24152666090.pdf
    • https://cdn.shopify.com/s/files/1/0428/2014/1223/files/77557540643.pdf
    • https://cdn.shopify.com/s/files/1/0433/0523/8688/files/alfonsina_storni_poemas.pdf
    • https://static.usrfiles.com/ugd/b8c837_3bb1240c36df4070a09f433bd2f94fb8.pdf
    • https://static.usrfiles.com/ugd/2b3f46_64bc60f7f3634f2f988b14e7b7dfd3cc.pdf
    • https://static.usrfiles.com/ugd/8ba634_ba4f90fbbb2d4aa68afe3fa66aedb5e4.pdf
    • https://static.usrfiles.com/ugd/b8c837_63be9aad80654b8fbedc3e38fa9dc152.pdf
    • https://static.usrfiles.com/ugd/b8c837_1779f72805b5484d8595fa4a2d796370.pdf
    • https://static.usrfiles.com/ugd/b8c837_2e001332d39b4cd69e54935833f64099.pdf
    • https://static.usrfiles.com/ugd/b8c837_946e224b9e224da3ba33e5d7e7495b8f.pdf
    • https://static.usrfiles.com/ugd/b8c837_c025833d1d234c23969e4c6b46ed53dd.pdf
    • https://static.usrfiles.com/ugd/b8c837_95e3fd9b63754def9f9f155dcc2c4c7c.pdf
    • https://static.usrfiles.com/ugd/07625c_6bae7d810f234ea08e31210ff9b96dae.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_off00005178.bin
dd6be07290cb90896275e027bc7c263bc9bcb0abc30f12c6f3138b34e9d50e4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5178 5384 bytes
font_01_sfnt_off000063b5.bin
4e851a9299819c492281345a7941eb45eb1c99cafa6c333a8425d5397620fee9
pdf-font-stream PDF embedded font (sfnt) at offset 0x63B5 14640 bytes
font_02_sfnt_off00008fb0.bin
073dee480399a0a44f59834a72d2ef372219071628d3787cc95d902351e1adc0
pdf-font-stream PDF embedded font (sfnt) at offset 0x8FB0 16124 bytes