Malicious PDF — malware analysis report

Static analysis result for SHA-256 621ae248e75f0deb…

MALICIOUS

PDF

42.5 KB Created: 2020-08-22 01:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f42924210f12a4e6a8cc07b4a5c081c SHA-1: 47fbc2d6bd5de41964f39623de80746d5ca42217 SHA-256: 621ae248e75f0debe76068dc986e26457ac07070376716a63d968d58fdfd042f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=never+back+down+movie'. Additionally, it exhibits a PDF link farm heuristic, suggesting it's part of a larger SEO poisoning or spam campaign. The ML classifier also strongly flagged this PDF as malicious. The embedded document body, though heavily corrupted, contains the same malicious URL.

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=never+back+down+movie
    • http://files.umicad.com/uploads/1/3/1/6/131637546/dujasesetoreda.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/2358/7733/files/accountability_in_the_bible.pdf
    • https://cdn.shopify.com/s/files/1/0434/0740/9319/files/guvodotijurewob.pdf
    • https://cdn.shopify.com/s/files/1/0437/4760/6679/files/bad_religion_the_empire_strikes_first.pdf
    • https://cdn.shopify.com/s/files/1/0432/9861/9550/files/88392355677.pdf
    • https://cdn.shopify.com/s/files/1/0431/7521/5258/files/timogotatane.pdf
    • https://cdn.shopify.com/s/files/1/0430/8061/4041/files/lifibefigupemivimezamapa.pdf
    • https://cdn.shopify.com/s/files/1/0448/6122/7169/files/bone_tissue_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0429/2182/0313/files/ncert_maths_class_10.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_off000067a0.bin
db90e3e860a9b83cdc66cd8249ce51219f3652bd7f1be0cdd21097b0a1e4b96b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67A0 5200 bytes
font_01_sfnt_off0000794e.bin
4034d23e15bb172e297409b6fdc9c95b361bb39889b76f60c32ac2e40bec76f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x794E 10624 bytes

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