Malicious PDF — malware analysis report

Static analysis result for SHA-256 666647cfbe413546…

MALICIOUS

PDF

43.5 KB Created: 2020-09-02 00:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ddb1d8f7364fd0e97daf4a7ac37f203c SHA-1: 544fd2cfb80d68bfe1ec2681f2ede0527ed4ab1f SHA-256: 666647cfbe413546279d149bcc4d9d968913d8cf2dd02675b1c3cee58866a785
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous Shopify URLs, likely to improve SEO for the malicious redirector. The primary malicious URL, https://ttraff.club/pify?keyword=addition+sums+with+carrying+worksheet, is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other Shopify links, suggesting a social engineering lure to disguise the malicious intent. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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.club/pify?keyword=addition+sums+with+carrying+worksheet In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4595/1400/files/amoretti_sonnet_79.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4818/9595/files/free_download_acrobat_reader_converter.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6980/9575/files/25373569310.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9531/7918/files/microtype_keyboarding_skill_builder_game_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/sazuxaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0727/0297/files/varedenarafipikinotimobuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2683/1784/files/78609018139.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2011/4344/files/86763892150.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2451/5229/files/80623868724.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6392/7206/files/nekibidowuvu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/kifipobemagulepojolevigal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5136/0164/files/manual_biblico_nelson.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/kebox.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3aee12_7b15c3bbacc14bc7b583ef608f60321c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_439bb322d2284741ae73232b0a5f10b2.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BFE 5568 bytes
SHA-256: 09fb28a48cf1582b53f8b9ac4aa399ea0847056b45a10adcc139d77b4b1fdfe4
font_01_sfnt_off00007ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EDE 10068 bytes
SHA-256: 13c27376f22506e6c4a453836aa6ae1fe03c957d04e314861fbc6d7f3ef85373

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