Malicious PDF — malware analysis report

Static analysis result for SHA-256 62aa983ea363be39…

MALICIOUS

PDF

35.6 KB Created: 2020-08-29 23:41:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 139b7dc62b7af7efac32eece536cf0fb SHA-1: 18ad037b73ebc5552a6c5704f5dc5cca37b1484f SHA-256: 62aa983ea363be39428a438fb078d915cf07823d122f3ec3d219609f51bd5814
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.ru/wix?keyword=g+shock+protection+user+manual. It also exhibits characteristics of a PDF link farm, embedding numerous external links, many of which point to Shopify-hosted PDFs. The document body, though heavily obfuscated, contains references to the malicious URL and benign-looking PDF filenames, suggesting a lure to disguise the malicious intent. The ML classifier strongly flags 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.ru/wix?keyword=g+shock+protection+user+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0460/1328/4511/files/arena_software_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0434/5734/7749/files/gadote.pdf
    • https://cdn.shopify.com/s/files/1/0428/6621/3031/files/commonly_misspelled_words_worksheet_high_school.pdf
    • https://cdn.shopify.com/s/files/1/0435/0876/0742/files/62837457211.pdf
    • https://cdn.shopify.com/s/files/1/0438/0780/1504/files/arun_sharma_data_interpretation_8th_edition_free_download.pdf
    • https://static.usrfiles.com/ugd/b8c837_ab181c78135d41809a4d3d37dd25602a.pdf
    • https://static.usrfiles.com/ugd/b8c837_61e9ac62fda44b49bbb4f0c32d5f05b1.pdf
    • https://static.usrfiles.com/ugd/e33828_a6e413599f704fbea58442e1537cc88b.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0ebfcabce4c4cf0a162a5a8fcf1f344.pdf
    • https://static.usrfiles.com/ugd/576447_b96dc0bde8e94e31acd84365ac8c2579.pdf
    • https://cdn.shopify.com/s/files/1/0435/9415/4146/files/cvx_earnings_date.pdf
    • https://cdn.shopify.com/s/files/1/0434/1248/8348/files/food_quality_assurance.pdf
    • https://static.usrfiles.com/ugd/b8c837_93d019b8bbcd4ebda7b4fe1d0639c6ba.pdf
    • https://static.usrfiles.com/ugd/b8c837_59da4d82b3f7489ba22734dd22dd03bd.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_off00004c07.bin
a2ed79c609d45afddfb39c6369150d0f0aac0d01d6aa11b5a34287ddb59ab8c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C07 5268 bytes
font_01_sfnt_off00005dc7.bin
9ed6330be5d5e063cc700e4e1f03f165db0a28a3154acf54e40ed243922a81fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DC7 10488 bytes

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