Malicious PDF — malware analysis report

Static analysis result for SHA-256 941cade274f872df…

MALICIOUS

PDF

44.2 KB Created: 2020-08-11 11:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be0310ca1583c302c61661ab96325f58 SHA-1: bc131c8811acd95319fb2f209fe4cb5d5c1c9512 SHA-256: 941cade274f872df7a4d26cfd47bae4c61a12ed1695560a2c80b91fd6012480c
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to potentially malicious redirectors, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The primary lure appears to be a calendar, as suggested by the document body and URL keywords. The ML classifier strongly flagged this PDF as malicious. The document body itself contains the malicious URL, suggesting it's intended to redirect the user to a harmful site.

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/wb?keyword=calendario%202018%20para%20imprimir%20pdf%20bonitos
    • http://gujokif.maison-lamartine.com/uploads/1/3/1/6/131607062/3fb4ca2dc45e.pdf
    • http://files.lect2.org/uploads/1/3/1/4/131407361/mexizujidot-wajen-rawononep-nitep.pdf
    • http://files.kmichellemcgregor.com/uploads/1/3/1/4/131437513/7605935.pdf
    • http://gutasak.bigwatervista.com/uploads/1/3/0/7/130776485/29e0df13af01b3f.pdf
    • http://waporezev.rockingokc.com/uploads/1/3/2/3/132302942/bozimomowokiwigemaro.pdf
    • https://cdn.shopify.com/s/files/1/0432/4176/7072/files/pebekofesesuganudigimadi.pdf
    • https://cdn.shopify.com/s/files/1/0438/4112/6565/files/89830407594.pdf
    • https://cdn.shopify.com/s/files/1/0431/1498/7669/files/88184150149.pdf
    • https://cdn.shopify.com/s/files/1/0429/8378/4601/files/36726740555.pdf
    • https://cdn.shopify.com/s/files/1/0434/1334/0312/files/skillpipe_to.pdf
    • https://cdn.shopify.com/s/files/1/0428/7230/7875/files/3307206870.pdf
    • https://cdn.shopify.com/s/files/1/0437/5996/0218/files/11355423911.pdf
    • https://cdn.shopify.com/s/files/1/0431/4382/3511/files/77857173280.pdf
    • https://cdn.shopify.com/s/files/1/0433/1218/5494/files/articulos_cientificos_medicina.pdf
    • https://cdn.shopify.com/s/files/1/0432/8036/7780/files/mepufu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/english_learning_30_days.pdf
    • https://cdn.shopify.com/s/files/1/0428/3020/0991/files/vididobevifurisegoma.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/juxumadebamapetutorobegew.pdf
    • https://cdn.shopify.com/s/files/1/0429/0487/9267/files/95887643247.pdf
    • https://cdn.shopify.com/s/files/1/0435/4719/7594/files/55195531244.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_off00006af7.bin
d16204e1750b17ff41bd4c0b4ed6d42ff250c4e3a2ffd22b5629291c2120c7aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF7 5752 bytes
font_01_sfnt_off00007e6e.bin
824c119adc25677115af9caebab89ae86ae87a85ef153b396c10e6e9d2cfe91f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E6E 11456 bytes