Malicious PDF — malware analysis report

Static analysis result for SHA-256 0662535b6d04bc2c…

MALICIOUS

PDF

65.6 KB Created: 2020-09-01 19:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67e370876bed2dbd5cd460cfa5177f15 SHA-1: 092230d91346cbed4a97cd16d84d75c6125a6a12 SHA-256: 0662535b6d04bc2cf99bc441d79c0195ae0fa75f91d36e8d4559cf5be79d00ca
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 'https://ttraff.com/wix?keyword=phet+balancing+chemical+equations+simulation+answer+key'. Additionally, it exhibits characteristics of a PDF SEO link farm, with numerous links to external PDFs, many of which are hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector 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.com/wix?keyword=phet+balancing+chemical+equations+simulation+answer+key
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9403/2040/files/rizoja.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5276/files/4775252016.pdf
    • https://cdn.shopify.com/s/files/1/0431/5162/2306/files/61701233899.pdf
    • https://cdn.shopify.com/s/files/1/0428/0818/0895/files/herculine_barbin.pdf
    • https://cdn.shopify.com/s/files/1/0430/7399/4905/files/cfa_level_3_books_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/7668/1882/files/definition_of_differential_calculus.pdf
    • https://cdn.shopify.com/s/files/1/0462/7087/3762/files/instagram_dark_theme_android_9.pdf
    • https://static.usrfiles.com/ugd/b8c837_47cfeca3f1c243eda5b29a7c532e31b0.pdf
    • https://static.usrfiles.com/ugd/b8c837_5cdb85e260694944968d6c7e18b42741.pdf
    • https://static.usrfiles.com/ugd/3aee12_817c44b20c7c428a89e0f7504bba31c1.pdf
    • https://static.usrfiles.com/ugd/80bfa9_b27f56778ada459286724e9bdb22b1c1.pdf
    • https://static.usrfiles.com/ugd/7f16bd_bc968694a9ef4fac9264afb28b5dec86.pdf
    • https://static.usrfiles.com/ugd/868401_77478d35080d41389df8e04825393a01.pdf
    • https://static.usrfiles.com/ugd/38bf1f_da8b29fcd63941c8bcc5ecd25abc335a.pdf
    • https://static.usrfiles.com/ugd/6c98bc_9b65e1a27e9b4b57851657f479ecfb99.pdf
    • https://static.usrfiles.com/ugd/b11f6d_5c891f3a032a4dd48573a423ebde7505.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b623.bin
85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB623 2828 bytes
font_01_sfnt_off0000c01d.bin
bec207d0e821f3f99f1856110b1ad5a4bb44ee03e2a5448d51aa704ddcf4975f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC01D 5736 bytes
font_02_sfnt_off0000d388.bin
fbfe7625ca22da10cc2dd8a37f5a833d37c84a1dbed830ab8a29ab42177c8494		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD388 10096 bytes

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