Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c81a5b775a8e5b…

MALICIOUS

PDF

43.5 KB Created: 2020-08-14 02:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1cb2cf7fb25c875bbf870d60b5ea7a4 SHA-1: 8bdbd250998576d58bef935e37a758b95bb889b7 SHA-256: d4c81a5b775a8e5b27cc973d46b1f4705cf05519199032ee102125f64ee61a35
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lure users to malicious sites. The document body, though partially corrupted, contains text related to Excel formatting and the wkhtmltopdf tool, suggesting a lure to download or view content related to these topics. The presence of numerous external PDF links, many hosted on Shopify, further indicates a link farm or SEO poisoning tactic to attract victims. The ML classifier strongly flagged this PDF as malicious.

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=excel+bedingte+formatierung+wochentag+ganze+spalte
    • http://files.byrdhouseandladybugs.com/uploads/1/3/1/1/131164520/vanor-pumopejulun-loluvaxevu-sigutafidaw.pdf
    • http://jorepu.blueheronsynergy.com/uploads/1/3/0/7/130738824/diremepopal_sapubikodovojul.pdf
    • http://xofikekon.charlottedixon.net/uploads/1/3/1/4/131436977/rizamude-mubabemata-giwiwixik.pdf
    • http://files.thirdeyeelixir.com/uploads/1/3/0/9/130969825/4035c4189977.pdf
    • https://cdn.shopify.com/s/files/1/0435/2465/3224/files/30528963140.pdf
    • https://cdn.shopify.com/s/files/1/0430/9073/9361/files/github_recover_deleted_branch.pdf
    • https://cdn.shopify.com/s/files/1/0434/1107/9317/files/accounting_standards_summary_2020.pdf
    • https://cdn.shopify.com/s/files/1/0435/6718/6079/files/ambrose_bierce_devil_s_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0445/8987/5364/files/avg_tuneup_2015_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0429/2411/4076/files/50821629712.pdf
    • https://cdn.shopify.com/s/files/1/0438/3526/1085/files/from_genes_to_genomes_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0439/8442/1022/files/fojer.pdf
    • https://cdn.shopify.com/s/files/1/0431/5519/4011/files/65139547949.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/zetegudu.pdf
    • https://cdn.shopify.com/s/files/1/0437/7948/9950/files/cognitive_development_in_early_adulthood.pdf
    • https://cdn.shopify.com/s/files/1/0435/0741/7253/files/kizimevamelakaseginosax.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gamusuzojikifikukudubug.pdf
    • https://cdn.shopify.com/s/files/1/0440/7469/6856/files/how_to_get_rusty_sword_osrs.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_off0000665b.bin
49d2502e532e9316964720c4f5d85f4b55c172241c129b7abb50e2ecabaa5422		 pdf-font-stream PDF embedded font (sfnt) at offset 0x665B 5876 bytes
font_01_sfnt_off00007a44.bin
87a78af94be7cb69f5f1e9cff1c2cbf7ececab7f5a14cfed9f8a28e03190d222		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A44 11076 bytes

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