Malicious PDF — malware analysis report

Static analysis result for SHA-256 7286d9da2b123aa4…

MALICIOUS

PDF

32.8 KB Created: 2020-08-30 16:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9de2104c975949a057012edadd3972f SHA-1: a821b98856b1f70cb2b3160ec149ac131ffdd833 SHA-256: 7286d9da2b123aa4832f21e13be656c23afb040cd978bcb0834fca5875d29405
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector URL. This behavior is indicative of a link farm designed to obscure the final malicious destination. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector URL supports the conclusion that this file is used 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.com/wix?keyword=film+analysis+a+norton+reader+%2528secon
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/5547/1006/files/79068277259.pdf
    • https://cdn.shopify.com/s/files/1/0434/4211/0631/files/google_play_games_apk_for_ios.pdf
    • https://cdn.shopify.com/s/files/1/0433/6710/4664/files/mueller_report_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/2955/2552/files/fm_21-_75.pdf
    • https://static.usrfiles.com/ugd/696b8a_c17ea54e9bdc4f55bb816b7d03af9b60.pdf
    • https://static.usrfiles.com/ugd/3b7182_a751706bf9e840c8a16edd7b8d1855d9.pdf
    • https://cdn.shopify.com/s/files/1/0429/2247/5687/files/castles_2_siege_and_conquest_free_do.pdf
    • https://cdn.shopify.com/s/files/1/0428/8076/2023/files/vekanukuraji.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/biotic_and_abiotic_factors_influencing_insect_life.pdf
    • https://cdn.shopify.com/s/files/1/0427/9359/9132/files/79367446963.pdf
    • https://cdn.shopify.com/s/files/1/0435/0024/1061/files/cancer_screening_guidelines_for_adults.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_off0000449e.bin
c4341890f321c8bef91944a1e89362b4a8cacc636abace7955e1633ad1ef84e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x449E 5220 bytes
font_01_sfnt_off0000564b.bin
de515e8e7bf0bad6f5c39b3ee456176427e817677fbe3b4a01aae8d79e17abe7
pdf-font-stream PDF embedded font (sfnt) at offset 0x564B 9444 bytes