Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb67a4ce5982871d…

MALICIOUS

PDF

35.5 KB Created: 2020-08-08 16:40:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abc2a5f78f81374240b272dcc6fec029 SHA-1: 8fb2adf8b49a52b843733a9e9ee4bd3d0880921d SHA-256: bb67a4ce5982871d8897f8663aef15252ac39a3c87d72b460b73bd42e8b147ab
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The ML classifier also flagged this PDF as malicious. The document body appears to be malformed or obfuscated, but the presence of numerous external links suggests an attempt to manipulate search engine results or redirect users to malicious sites. No scripts were extracted from this sample.

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.ru/pify?keyword=aulularia+testo+latino+a+fronte+pdf
    • http://files.oakmountainfirewood.com/uploads/1/3/0/8/130874010/7878770.pdf
    • http://vodenol.musicbyspecialarrangement.com/uploads/1/3/1/3/131379246/7102437.pdf
    • http://files.videointeractionproject.org/uploads/1/3/1/3/131382092/15690596f2de4.pdf
    • http://wepugaf.texastyp.org/uploads/1/3/1/4/131410007/jezawaboguguf-kamiwefab-xuwadu.pdf
    • http://files.rexminibrick.com/uploads/1/3/1/4/131437849/6920950.pdf
    • https://cdn.shopify.com/s/files/1/0431/3900/6615/files/zokizezudisizuzo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1943/6185/files/clostridium_difficile_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0435/8393/0527/files/padipibusakurozu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5933/9674/files/dojalodizavukowurikavi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8492/2526/files/rivitopanoserolel.pdf
    • https://cdn.shopify.com/s/files/1/0435/4034/9082/files/takurelematesuvuwuk.pdf
    • https://cdn.shopify.com/s/files/1/0447/0964/2394/files/cefalotina_vademecum.pdf
    • https://cdn.shopify.com/s/files/1/0429/5272/0543/files/9858349456.pdf
    • https://cdn.shopify.com/s/files/1/0435/5388/2280/files/31462327009.pdf
    • https://cdn.shopify.com/s/files/1/0430/7212/7125/files/juvef.pdf
    • https://cdn.shopify.com/s/files/1/0437/0671/2219/files/bupuguvul.pdf
    • https://cdn.shopify.com/s/files/1/0436/1030/8766/files/aashto_method_of_flexible_pavement_design.pdf
    • https://cdn.shopify.com/s/files/1/0433/6851/3695/files/diborazuravibibiruwi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4712/4135/files/16617323757.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_off00004b11.bin
7bf261580097bd775387a2847fb566a57648bdfd86df5ee79e7eafca8a15a9da
pdf-font-stream PDF embedded font (sfnt) at offset 0x4B11 5024 bytes
font_01_sfnt_off00005c36.bin
b620020d78254aafcd831b8e48030448e977b4c702d0d8c4a99e1e3733113e82
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C36 10608 bytes