PDF malware analysis — malicious · c8a47bf255ba9028

MALICIOUS

PDF

46.1 KB Created: 2020-07-23 09:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 8157cede6f41bc57ebf146b986ad68a0 SHA-1: 7dbf581e59fd7e58e35820865237c52ea3c26d2e SHA-256: c8a47bf255ba902810f377011651d18b23d9b8c33f77419f106faf2fb1e39843

120 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK indicating a link to a known malicious redirector. Another critical heuristic, PDF_SEO_LINK_FARM, highlights the presence of a large number of external PDF links, suggesting a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, contains text related to 'effective teaching strategies in mathematics pdf', likely a lure. The primary IOC is the malicious redirector URL.

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=effective+teaching+strategies+in+mathematics+pdf
- http://files.joeyessmaracing.com/uploads/1/3/1/8/131857758/7490982.pdf
- http://files.edumentality.com/uploads/1/3/0/7/130739263/80d4ea135f2adb5.pdf
- http://files.jenkatz-buonincontro.com/uploads/1/3/1/3/131379099/tevib-judexosedu-dejosekapuva.pdf
- http://files.auroralutheranbiblecamp.com/uploads/1/3/0/8/130873949/2145838f3.pdf
- http://files.thevasculargroup.co.nz/uploads/1/3/1/4/131438490/pubiwekikorepus.pdf
- http://files.auroralutheranbi
- https://cdn.shopify.com/s/files/1/0432/1312/7835/files/xakimivinuni.pdf
- https://cdn.shopify.com/s/files/1/0432/2626/7806/files/feligesedu.pdf
- https://cdn.shopify.com/s/files/1/0435/5453/7624/files/72583191143.pdf
- https://cdn.shopify.com/s/files/1/0431/2757/0596/files/14612746424.pdf
- https://cdn.shopify.com/s/files/1/0432/4855/0050/files/48659080889.pdf
- https://cdn.shopify.com/s/files/1/0429/8443/9971/files/nijobupufixewigim.pdf
- https://cdn.shopify.com/s/files/1/0438/1035/7405/files/wojeluvefijasix.pdf
- https://cdn.shopify.com/s/files/1/0433/7631/2478/files/gofad.pdf
- https://cdn.shopify.com/s/files/1/0429/9925/1093/files/53400407943.pdf
- https://cdn.shopify.com/s/files/1/0437/2067/1384/files/90035391732.pdf
- https://cdn.shopify.com/s/files/1/0433/3410/7286/files/19681660781.pdf
- https://cdn.shopify.com/s/files/1/0437/3594/1274/files/90212367097.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_off0000776c.bin` `a673d9bb3f64129182984ac11cf9d5a8aaa032762b16cfd832453e95a2286394`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x776C	5232 bytes
`font_01_sfnt_off0000890d.bin` `02eb0adebec6df468de0b885fc68b6586e9d73dbf7be68072639b1422c126fe0`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x890D	9948 bytes

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