Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3dc3f2ea335613b…

MALICIOUS

PDF

48.2 KB Created: 2020-08-25 11:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb3ed9de793cec9893f0f51acea8bf0d SHA-1: 24446ab4b3f4c7fd5ded4ab909cf94458f76f6a0 SHA-256: f3dc3f2ea335613b58051aa344a581e7f27f95481070c8c1b3b7922bc5a73907
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a large number of embedded links, indicating a link farm or redirection attempt. One of the primary links directs to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'acr form for teachers in rajasthan' and includes the suspicious URL, suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=acr+form+for+teachers+in+rajasthan
    • http://vegotena.v-on-shenton.com/uploads/1/3/2/6/132680932/difen-xigig-sekaxud.pdf
    • https://cdn.shopify.com/s/files/1/0430/7333/9559/files/88850694827.pdf
    • https://cdn.shopify.com/s/files/1/0436/5395/5742/files/fudewulesozumotodu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8004/8023/files/nawilow.pdf
    • https://cdn.shopify.com/s/files/1/0434/0701/6103/files/lemorinafofemo.pdf
    • https://cdn.shopify.com/s/files/1/0437/5438/9665/files/satoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/8673/2707/files/98784615149.pdf
    • https://cdn.shopify.com/s/files/1/0451/4018/1146/files/87280304625.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00008ccd.bin
983254f1a6fcfd8654bfe6122e885f4018ebc98a6dc7d956969a24061a2cda95		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8CCD 12944 bytes
font_00_sfnt_off0000585d.bin
4d20d608aa8cd09b5d854c84c15486f3b066aa8552c478f6da1b6aa123f1406f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x585D 5156 bytes
font_01_sfnt_off000069ba.bin
3caffd6f40121d7cc2299f7a3043574f15c078f0344a234214a28e5dac931863		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69BA 10240 bytes

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