Malicious PDF — malware analysis report

Static analysis result for SHA-256 14fb6f2eccf68ac0…

MALICIOUS

PDF

33.1 KB Created: 2020-08-31 00:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94cd9a8bc530eb5a218b8a8c68c77a53 SHA-1: 15f7c7cc3cbd309143a26d368d7fb29cd42d5fa4 SHA-256: 14fb6f2eccf68ac0a0adb44bf8fa1c9ce40a662afb9d5c6d2868b96f618b5070
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting an attempt to manipulate search engine results or host further malicious content. The ML classifier strongly supports the malicious verdict.

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.cc/wix?keyword=akame+ga+kill+23+reddit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5014/7733/files/75964614968.pdf
    • https://cdn.shopify.com/s/files/1/0436/1283/1907/files/57421429748.pdf
    • https://cdn.shopify.com/s/files/1/0433/7755/7660/files/40831334192.pdf
    • https://static.usrfiles.com/ugd/07625c_19146dffcadb4dcbb29e148777a41c3f.pdf
    • https://static.usrfiles.com/ugd/09273f_9215ba2af6cc451688e7f976f85d0f68.pdf
    • https://static.usrfiles.com/ugd/87d215_0092a43ef84049a6958460d636f0f578.pdf
    • https://static.usrfiles.com/ugd/99965f_69a2dc3dcbad4c77b4156711de7859ba.pdf
    • https://static.usrfiles.com/ugd/bf650e_5fd6481f6ff7405c87f0bf7909fdff90.pdf
    • https://static.usrfiles.com/ugd/b8c837_440639ac48aa415889b8eed6d5e7fc38.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad9832d2efd24c09924b5cce1a436411.pdf
    • https://static.usrfiles.com/ugd/b8c837_f8cd5ee44960487a982fb377bac65caf.pdf
    • https://static.usrfiles.com/ugd/5cf23b_24de0769a25b46a2bc2487f2a5b2873f.pdf
    • https://static.usrfiles.com/ugd/48d9a1_b82dc27003844f6cb1f445f0cdef5f96.pdf
    • https://static.usrfiles.com/ugd/b8c837_96711c4ee1d3412d9f57b6d255b93abe.pdf
    • https://static.usrfiles.com/ugd/d3758e_818ff55ae16a4ddd92e33dd523c5bce9.pdf
    • https://static.usrfiles.com/ugd/b8c837_928da8534db641c1a63a7a9cb8334c3c.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004617.bin
aa92db9a2e034246bd393a33aa2362609cf3efc3c75fa9db22e796c7baea1b65
pdf-font-stream PDF embedded font (sfnt) at offset 0x4617 5316 bytes
font_01_sfnt_off00005816.bin
09fd889f2f948b2b36e415b1a708b76138dea35b50a9e7874532119a42586507
pdf-font-stream PDF embedded font (sfnt) at offset 0x5816 9256 bytes