Malicious PDF — malware analysis report

Static analysis result for SHA-256 1566dada57b639f6…

MALICIOUS

PDF

40.8 KB Created: 2020-08-05 14:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06ba64ac29de718c1ab1d72167f63db9 SHA-1: 93a6a2df0d9d1a9637f203bd87f52bdc06078fd4 SHA-256: 1566dada57b639f60d8c975c082f0a3f2ed1562ffe348fb474eced0d83223c94
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though obfuscated, contains a URL that mirrors the redirector's target. The ML classifier strongly indicates maliciousness, and the presence of multiple external PDF links suggests a link farm or redirection strategy to distribute malicious content.

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/pify?keyword=ley+general+de+administracion+publica+costa+rica+actualizada+pdf
    • http://dafam.jamkatzent.com/uploads/1/3/1/3/131380005/fukozemaweganuf.pdf
    • http://files.the-bookaneer.com/uploads/1/3/1/4/131437194/95b598116178.pdf
    • http://files.kimkirch.com/uploads/1/3/0/7/130775827/welobozutudirol-fulunim.pdf
    • http://files.weathershepherd.ca/uploads/1/3/0/9/130969545/konumonexifiw.pdf
    • http://files.chicagomovietours.com/uploads/1/3/2/6/132695354/bixaje.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/4386/3198/files/john_mayer_ain_t_no_sunshine.pdf
    • https://cdn.shopify.com/s/files/1/0430/1137/5267/files/lixova.pdf
    • https://cdn.shopify.com/s/files/1/0429/6278/0311/files/linidenopebogavapatirefo.pdf
    • https://cdn.shopify.com/s/files/1/0428/6231/3631/files/23583992149.pdf
    • https://cdn.shopify.com/s/files/1/0427/9356/6364/files/54953371422.pdf
    • https://cdn.shopify.com/s/files/1/0433/6903/7974/files/38113433370.pdf
    • https://cdn.shopify.com/s/files/1/0431/8386/6007/files/wisezifefejevinalutosivo.pdf
    • https://cdn.shopify.com/s/files/1/0428/0582/1599/files/wazotofikitawu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1218/5494/files/81682438727.pdf
    • https://cdn.shopify.com/s/files/1/0429/7523/2153/files/25186051235.pdf
    • https://cdn.shopify.com/s/files/1/0431/5024/6054/files/famedinituvamerexigoga.pdf
    • https://cdn.shopify.com/s/files/1/0427/9861/2636/files/bpsc_64_answer_key_download.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_off00005cdc.bin
c16706413afa2388f1e404e9f050808d28c5365f252ddc23a22e7b3021424bdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CDC 5708 bytes
font_01_sfnt_off00007049.bin
f5471897d8ff93c66dfe45195b30d96623981b028a6fbfa352a57018747726f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7049 10788 bytes

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