Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66cc3b244500a3c…

MALICIOUS

PDF

39.4 KB Created: 2020-08-11 09:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db04c3759021e832aea9f3b255ead286 SHA-1: cc78ace9714c4157082b606e5b8ee932454bc35f SHA-256: d66cc3b244500a3c8aa13f7b8aa1335907010bbe31485509bc1a4f6bde2b0995
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm infrastructure. The primary redirector URL, https://ttraff.com/pify?keyword=maths+book+class+11+cbse+pdf, is flagged as malicious. This suggests the document is designed to lure users into clicking these links, ultimately leading them to malicious content. No scripts were extracted, and the document body is heavily obfuscated.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.com/pify?keyword=maths+book+class+11+cbse+pdf
    • http://files.marzipan-media.com/uploads/1/3/1/8/131856184/7584706.pdf
    • http://files.linnukas.com/uploads/1/3/1/8/131871625/wolorupotesuro_newekorubuvexab.pdf
    • http://files.phoenixrpgtav.com/uploads/1/3/1/4/131438071/615577.pdf
    • http://norurej.fchseagleband.com/uploads/1/3/1/8/131871991/semipizapisasedokuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/4186/6403/files/zenith_remote_controls.pdf
    • https://cdn.shopify.com/s/files/1/0435/4169/2570/files/25381327967.pdf
    • https://cdn.shopify.com/s/files/1/0429/3260/0985/files/lezaraja.pdf
    • https://cdn.shopify.com/s/files/1/0447/9415/1061/files/91064825811.pdf
    • https://cdn.shopify.com/s/files/1/0435/0623/7604/files/tewiradevovogaguri.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/35133455348.pdf
    • https://cdn.shopify.com/s/files/1/0437/5340/6618/files/bash_global_variable.pdf
    • https://cdn.shopify.com/s/files/1/0432/0867/1394/files/amsco_apush_period_3.pdf
    • https://cdn.shopify.com/s/files/1/0433/2978/1918/files/pavejijoderew.pdf
    • https://cdn.shopify.com/s/files/1/0432/7600/9622/files/notisebovurofo.pdf
    • https://cdn.shopify.com/s/files/1/0438/3332/7776/files/resarepada.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_off00005d03.bin
4e522a7b02ca699b1fd66dcccca94d69e09864165ae70b58e01a4c2b3ace8539
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D03 5408 bytes
font_01_sfnt_off00006f68.bin
0917a2a2ec15bc37d19d964d072d59a0b9fe4145dce0147f729ec9185b3c4b54
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F68 9852 bytes