PDF malware analysis — malicious · a64c01f1b8ce9ac0

MALICIOUS

PDF

45.4 KB Created: 2020-07-31 12:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 99885cdda55fae7b2e46ca812acaf2c8 SHA-1: e5c1118562392c5d8d77f37a6276869c8c78fbbc SHA-256: a64c01f1b8ce9ac0e0651d7fcb3e39f08431cd931b789cda5f903384771669bc

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, a technique often used to create link farms for SEO manipulation or to redirect users to malicious sites. One critical heuristic firing indicates a direct link to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a 'Cornell critical thinking test', likely a lure to entice users to click the malicious links. 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.com/pify?keyword=cornell+critical+thinking+test+level+x+pdf
- http://files.allfloorsinteriors.com/uploads/1/3/0/9/130969375/kexajize.pdf
- http://files.redmondacademy.org/uploads/1/3/0/7/130739802/zosig-duguritezuzamuk-mexutula.pdf
- http://files.redeemwithgod.org/uploads/1/3/1/0/131070911/jomolagofon_bufalemo_jaber_nujukimalijoz.pdf
- http://files.fernando-guimaraes.com/uploads/1/3/2/6/132695915/piwelowor.pdf
- http://files.hobblevhorses.com/uploads/1/3/0/7/130739298/vekutinekerudi.pdf
- http://files.redmondaca
- https://cdn.shopify.com/s/files/1/0432/9819/3566/files/75419825110.pdf
- https://cdn.shopify.com/s/files/1/0431/4369/2445/files/xevepadujinewafemogoninag.pdf
- https://cdn.shopify.com/s/files/1/0429/8201/5129/files/vemojuj.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90067119925.pdf
- https://cdn.shopify.com/s/files/1/0428/4681/4374/files/31078288196.pdf
- https://cdn.shopify.com/s/files/1/0431/6105/9477/files/65837514096.pdf
- https://cdn.shopify.com/s/files/1/0437/7578/7162/files/filovutipubesazudipe.pdf
- https://cdn.shopify.com/s/files/1/0432/1620/8036/files/kepowoxatopikefizi.pdf
- https://cdn.shopify.com/s/files/1/0432/5651/2680/files/49638758847.pdf
- https://cdn.shopify.com/s/files/1/0430/5921/6537/files/15193003951.pdf
- https://cdn.shopify.com/s/files/1/0434/0393/5902/files/60771005083.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000720e.bin` `a67bd24895ee9cac48d8ed6d3760753b0bc069547dade47143fc246ecdef121e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x720E	5420 bytes
`font_01_sfnt_off00008474.bin` `4821f3f4dde3f4fbc8c41240d252684ab5240fb86fc714f19115424cdfbcf0c9`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8474	10348 bytes

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