Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd620cd0ab0fe28…

MALICIOUS

PDF

36.4 KB Created: 2020-09-03 22:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca7f5bb96971f6fcd4ce931451a72117 SHA-1: 53310fe0afa2227b9d1d61ff830ed7df8d016859 SHA-256: ecd620cd0ab0fe2834ac0ff8c9773887e9b4782d7f09d58a0176f0cee7a0fe1a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.me, which is likely used to host further malicious content or phishing pages. The document body, though heavily obfuscated, contains the URL and appears to be a lure for an educational worksheet. The presence of numerous links to PDFs hosted on cdn.shopify.com suggests a link farm technique to improve search engine ranking and distribute the malicious payload.

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.me/wix?keyword=introductory+verbs+worksheet
    • https://cdn.shopify.com/s/files/1/0431/4320/0929/files/7th_grade_ny_state_math_test.pdf
    • https://cdn.shopify.com/s/files/1/0432/4897/6032/files/bevifekosuzuzesasovogumim.pdf
    • https://cdn.shopify.com/s/files/1/0431/8212/9320/files/pomumabo.pdf
    • https://cdn.shopify.com/s/files/1/0434/6091/9446/files/68359982288.pdf
    • https://static.usrfiles.com/ugd/e23fbb_68e5629d87f6455c9fa8f7bfba1b5c69.pdf
    • https://static.usrfiles.com/ugd/dc8a8e_8ba561ce8e8d4e90a2df2f435a0a9fb2.pdf
    • https://static.usrfiles.com/ugd/6846fe_afc4cfded4264b29b1d5abe52eb56ba0.pdf
    • https://static.usrfiles.com/ugd/50de67_37861abe85d04f188bc41b83a41d7fa6.pdf
    • https://cdn.shopify.com/s/files/1/0436/9691/4600/files/tebuwogi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9740/7126/files/matakawebo.pdf
    • https://cdn.shopify.com/s/files/1/0465/8443/0759/files/sabafalojetuwiputuduwefe.pdf
    • https://cdn.shopify.com/s/files/1/0433/4374/1083/files/lurefasaparuzuromew.pdf
    • https://cdn.shopify.com/s/files/1/0428/9645/7884/files/mac_app_store_not_ing_xcode.pdf
    • https://cdn.shopify.com/s/files/1/0433/7693/5068/files/98981996451.pdf
    • https://cdn.shopify.com/s/files/1/0428/5032/0543/files/chaita_ki_chaitwal_video_song_hd.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004542.bin
d78992486f852572edb2dcd32f361c0eb6b76e385dcd2048dda2bb0a03a8d51d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4542 5016 bytes
font_01_sfnt_off00005659.bin
04a94523b835164fee6450e7e597a4d93d6a549d9a76d7a3f769da70a7940e6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5659 9504 bytes
font_02_sfnt_off000076d7.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76D7 4324 bytes

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