Malicious PDF — malware analysis report

Static analysis result for SHA-256 36cf8c86530fc64f…

MALICIOUS

PDF

42.6 KB Created: 2020-07-31 12:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af3e7f311dfc9600827e00230cd9751e SHA-1: fd7a376b67f4fb990d93ca3996168b8326cc4a23 SHA-256: 36cf8c86530fc64f6bcc9ac66c32bd3b83a5e06a1403711d6235af1a2b018505
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a 'PDF SEO Link Farm'. One of these links, 'https://ttraff.com/pify?keyword=fundamentals+of+electrical+engineering+bobrow+pdf+download', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be malformed or truncated, but the presence of the link farm and the malicious redirector strongly suggest an attempt to lure users to malicious content.

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/pify?keyword=fundamentals+of+electrical+engineering+bobrow+pdf+download
    • http://files.missouri-al-anon.org/uploads/1/3/1/4/131453045/519921.pdf
    • http://files.gloriousseaglass.com/uploads/1/3/2/7/132740637/9217886.pdf
    • http://files.asiandmore.com/uploads/1/3/1/3/131398338/eea645d395f6af.pdf
    • http://files.vancees.net/uploads/1/3/2/6/132682802/ralujedew.pdf
    • http://files.soulandsynergyec.com/uploads/1/3/0/7/130775647/08fce.pdf
    • https://cdn.shopify.com/s/files/1/0428/9134/6079/files/lemimedimu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5892/0605/files/logafisivonof.pdf
    • https://cdn.shopify.com/s/files/1/0431/4441/3341/files/66215965132.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sejil.pdf
    • https://cdn.shopify.com/s/files/1/0435/2314/5896/files/nowudejum.pdf
    • https://cdn.shopify.com/s/files/1/0434/6590/0196/files/dixivokabu.pdf
    • https://cdn.shopify.com/s/files/1/0440/1466/5886/files/fuziforoxofobefowuto.pdf
    • https://cdn.shopify.com/s/files/1/0430/9290/2037/files/20624742562.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mowojemabedeju.pdf
    • https://cdn.shopify.com/s/files/1/0428/5323/6902/files/56549414946.pdf
    • https://cdn.shopify.com/s/files/1/0436/5543/0302/files/fisivaleju.pdf
    • https://cdn.shopify.com/s/files/1/0434/1379/9064/files/46019909122.pdf
    • https://cdn.shopify.com/s/files/1/0432/6568/7717/files/395492628.pdf
    • https://cdn.shopify.com/s/files/1/0434/1451/9973/files/jarafatun.pdf
    • https://cdn.shopify.com/s/files/1/0432/6785/0390/files/vevoruvawidusat.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/
    • https://cdn.shopify.com/s/files/1/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066b0.bin
582d5faf834b1fc296aed812eee7feff7cbe638a860ec78380501c1f99574bbb
pdf-font-stream PDF embedded font (sfnt) at offset 0x66B0 5544 bytes
font_01_sfnt_off0000797d.bin
a2204f2f1479b8c547944833a8282afc02009c24e243f8b0c78e3a57da375a8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x797D 10248 bytes