Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a26a63f28d72d0…

MALICIOUS

PDF

39.4 KB Created: 2020-07-12 12:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5dfce5e21b46a528e27aefba749df6e7 SHA-1: 91fd0889c74564a103576f22dfc4b3b955bf6204 SHA-256: a2a26a63f28d72d0b2a196ac3b921210da462f5e4ccf923e6945cb10833a304d
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, identified by the PDF_SEO_LINK_FARM heuristic. One of these links, https://ttraff.ru/pify?keyword=ejercicios+valores+del+se+2o+bachillerato+resueltos, is flagged as a malicious redirector. The document body contains garbled text but also includes the same URL and a list of other PDF links, suggesting a coordinated effort to distribute malicious content or engage in SEO poisoning. No scripts were extracted from this sample.

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=ejercicios+valores+del+se+2o+bachillerato+resueltos
    • http://files.mychangingthenarrative.com/uploads/1/3/1/4/131483034/0c8d8d6118b4.pdf
    • http://files.houseoffinland.org/uploads/1/3/2/6/132696621/26a60c5a668ce.pdf
    • http://files.synergymhs.com/uploads/1/3/0/7/130776006/d82db0.pdf
    • http://files.salisburysdachurch.org/uploads/1/3/1/1/131164506/ragiserigepefi-kulonatamu.pdf
    • http://files.little-childrens-bible-school.com/uploads/1/3/1/3/131380733/guluxe.pdf
    • http://files.haggere.com/uploads/1/3/1/8/131871894/5056092.pdf
    • http://files.handhills.ab.ca/uploads/1/3/2/6/132695874/b6655.pdf
    • http://files.rayconant.com/uploads/1/3/1/4/131406433/b932f67c16e.pdf
    • https://buvisiz343164486.files.wordpress.com/2020/07/59732542858.pdf
    • https://lumuganad.files.wordpress.com/2020/07/27637158274.pdf
    • https://fipenizetizo.files.wordpress.com/2020/07/2191561019.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84302935330.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/luzugojozawok.pdf
    • https://cdn.shopify.com/s/files/1/0432/5395/6758/files/remopiwipirevasobewar.pdf
    • https://cdn.shopify.com/s/files/1/0429/9928/3863/files/vejitaropoxeko.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/9467339244.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61086590007.pdf
    • https://cdn.shopify.com/s/files/1/0428/0988/4838/files/28390511351.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_off00005759.bin
6d0d62d1f9619b303ee1bd944fc3e1b757bf87866ebf8e06bc3ef4037fbdab01
pdf-font-stream PDF embedded font (sfnt) at offset 0x5759 5168 bytes
font_01_sfnt_off00006903.bin
8652cb78edcde39cabf2684b20a75abae1e94fca5352f292937db721ffb1f05a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6903 11548 bytes