Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d9322368d58126…

MALICIOUS

PDF

37.8 KB Created: 2020-08-07 05:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a96255916c487f3733b9ddf00a5c6f11 SHA-1: 78907d80422201d9b42c565cdf07eba74e86a70d SHA-256: c9d9322368d58126ac5d5701f012d5926bb4c04f0428d6ca3b4d7eac325a8365
150 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 external PDF files hosted on various domains. One of these links, https://ttraff.cc/pify?keyword=domestic+animals+colouring+pages+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect users to malicious infrastructure. 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.cc/pify?keyword=domestic+animals+colouring+pages+pdf
    • http://files.lizziedavey.com/uploads/1/3/2/7/132740700/zunoxitepu.pdf
    • http://files.nadinebrockel.de/uploads/1/3/1/4/131408854/e61f58f650.pdf
    • http://files.abeautifulmess.net/uploads/1/3/1/6/131606408/2714fb6e65.pdf
    • https://cdn.shopify.com/s/files/1/0429/9590/8761/files/42593591846.pdf
    • https://cdn.shopify.com/s/files/1/0428/7656/7711/files/41471542468.pdf
    • https://cdn.shopify.com/s/files/1/0433/1952/5531/files/drawing_tools_and_their_uses.pdf
    • https://cdn.shopify.com/s/files/1/0432/5621/7750/files/84930312629.pdf
    • https://cdn.shopify.com/s/files/1/0430/2041/9226/files/amoeba_sisters_dna_replication_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0435/8524/1256/files/vetaxebenuw.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5684/files/around_the_world_in_80_days_file.pdf
    • https://cdn.shopify.com/s/files/1/0433/3741/6869/files/89244294456.pdf
    • https://cdn.shopify.com/s/files/1/0438/0783/4272/files/tank_warrior_bis_classic.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_off0000552b.bin
aa83792ebc0a51aa64106348c76f648322b954c7487a3a7fc2665a56e517a202		 pdf-font-stream PDF embedded font (sfnt) at offset 0x552B 5476 bytes
font_01_sfnt_off000067b7.bin
8f5745ca7f5243ed922fc48e0c2a2301b1f801bf2bdec8a1f27201266568cf50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67B7 10236 bytes

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