Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd52a8f1143cbe8…

MALICIOUS

PDF

42.5 KB Created: 2020-08-04 05:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a11a4af84818e7119f75fd37e4229763 SHA-1: 28d3811a3740d633ee65c26ab947cff87ec3e34b SHA-256: 8dd52a8f1143cbe8eaa37f92c80bc87f886bed2cfb1afc3ac0e02a2ec77b1048
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which are SEO-optimized to appear as legitimate documents. One prominent link, disguised as 'algebra worksheets pdf with answers', redirects to a known malicious domain (ttraff.com). This indicates a social engineering tactic to drive traffic to malicious infrastructure, likely for further exploitation or phishing. The ML classifier strongly supports the malicious nature of this PDF.

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=algebra+worksheets+pdf+with+answers
    • http://files.caloriecorner.com/uploads/1/3/1/8/131872079/muragozudulo-vitoloserenibu-nabewogafineluw-dufazexiwofo.pdf
    • http://files.jacksonvilleartistsguild.org/uploads/1/3/0/7/130775557/nasinonuninolukafaz.pdf
    • http://files.redhawktheaterbc.com/uploads/1/3/1/3/131381095/najusuvufipade_ruzon_tebuzogodotede_revalizo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3728/5797/files/battlestar_galactica_1978.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fofigez.pdf
    • https://cdn.shopify.com/s/files/1/0427/9356/6364/files/wiwoxum.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/neretidesalefadim.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7287/files/wofuxigetog.pdf
    • https://cdn.shopify.com/s/files/1/0433/3607/3366/files/55776846238.pdf
    • https://cdn.shopify.com/s/files/1/0433/2558/7610/files/43031520014.pdf
    • https://cdn.shopify.com/s/files/1/0438/1330/6530/files/sokibasuked.pdf
    • https://cdn.shopify.com/s/files/1/0433/6759/6184/files/81373067332.pdf
    • https://cdn.shopify.com/s/files/1/0430/3880/2073/files/99182495268.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/presto_pressure_canner_manual.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_off0000661a.bin
a13acd67fc0e30a07662f3dc470c011a23db64bafdde675a3e54c5092278b104		 pdf-font-stream PDF embedded font (sfnt) at offset 0x661A 5588 bytes
font_01_sfnt_off00007923.bin
13d58e6446f897802c6ba245b999bee739b0bbd5f1f51e467381a31f7d13fc55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7923 10744 bytes

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