Malicious PDF — malware analysis report

Static analysis result for SHA-256 64548c16fe78645d…

MALICIOUS

PDF

55.3 KB Created: 2020-08-30 18:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bea96e898291569f5ea295ee28f5561 SHA-1: d5d3486ba112476c258752d58128c40cc15e43a6 SHA-256: 64548c16fe78645df6f42c296ecfed3ac39748103a9d18a5790ee076a73f7dca
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. It also exhibits a link farm heuristic, embedding numerous external PDF links, one of which is presented as a marriage invitation. The ML classifier strongly flagged this PDF as malicious. The embedded URL is likely intended to redirect the user to a malicious site for phishing or further payload delivery.

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/wix?keyword=ayumi+chan+no+natsuyasumi
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/3313/2193/files/marriage_invitation_card_psd_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/8030/2238/files/pokabigemari.pdf
    • https://cdn.shopify.com/s/files/1/0434/4774/6716/files/algebra_1_textbook_houghton_mifflin_harcourt.pdf
    • https://cdn.shopify.com/s/files/1/0437/7765/4942/files/kigurodedawilanopedomu.pdf
    • https://cdn.shopify.com/s/files/1/0437/9462/8769/files/adrenal_gland_adenoma_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0435/4726/3128/files/certificate_of_incorporation_kenya.pdf
    • https://cdn.shopify.com/s/files/1/0435/0545/1174/files/17632159798.pdf
    • https://static.usrfiles.com/ugd/238140_9223abbcee0248a585d60be6515e0866.pdf
    • https://static.usrfiles.com/ugd/b8c837_b4438127516d449db6303ab701351ec8.pdf
    • https://static.usrfiles.com/ugd/b8c837_1ad7d38a9d6d4117b1ffcbc1dd856122.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3429/files/tasegevefapijufuzogose.pdf
    • https://cdn.shopify.com/s/files/1/0435/9972/4703/files/dubarabuwaxox.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f8c.bin
48f90f273c9099da8507916f6607e218feaa01c023c90a44e475fe874220847c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F8C 11944 bytes
font_01_sfnt_off000086f2.bin
d3b068b9d80521de209eb661bb453dca656fb5b89a654e88780cf42c65895df4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86F2 4768 bytes
font_02_sfnt_off000096f6.bin
c471fe2bd8396b21801aa58e66e1ea561b57a6ac8fd24bb50d05a5d79373be3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96F6 13764 bytes
font_03_sfnt_off0000c241.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC241 4324 bytes

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