Malicious PDF — malware analysis report

Static analysis result for SHA-256 685f0a21c08a0015…

MALICIOUS

PDF

41.3 KB Created: 2020-08-19 01:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b46adee34190ae77bd93924a0d72f6c6 SHA-1: 0eeb9c27c43712237e13ce93ab3b25c36225e6d0 SHA-256: 685f0a21c08a0015431b730b74bbe6e95958d96272b0d7128b01e067d9009b9c
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for users interested in 'netflix app android freezes'. This suggests an attempt to direct users to malicious content or phishing pages. The presence of numerous external links, many hosted on Shopify, indicates a link farm strategy, likely to obscure the ultimate destination or to improve SEO for 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.ru/pify?keyword=netflix+app+android+freezes
    • http://files.prayercloset.us/uploads/1/3/0/8/130873983/vatumegig_rinitamaforijo_tunowabopiz_gegewudanodoz.pdf
    • http://files.idahobluegrassassociation.org/uploads/1/3/0/8/130874050/8422788.pdf
    • http://popim.aleksandarmatovski.com/uploads/1/3/1/0/131070447/pugifejuvatuwex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/7215/1959/files/gukagidefigoda.pdf
    • https://cdn.shopify.com/s/files/1/0429/2529/3724/files/adobe_reader_for_windows_10_64.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/23271273484.pdf
    • https://cdn.shopify.com/s/files/1/0440/4995/7029/files/44238867033.pdf
    • https://cdn.shopify.com/s/files/1/0430/3313/3209/files/67202990183.pdf
    • https://cdn.shopify.com/s/files/1/0437/2001/6021/files/17973914162.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/free_3rd_grade_multiplication_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0429/3686/0839/files/wysiwyg_web_builder_templates.pdf
    • https://cdn.shopify.com/s/files/1/0432/5244/9435/files/35487524924.pdf
    • https://cdn.shopify.com/s/files/1/0449/1106/7291/files/hdfc_mutual_fund_common_transaction_form.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_off0000574a.bin
4c4e8e6dafd464882e9062a62c3cc6e526bd8348143fa3e562a59468e21f2685		 pdf-font-stream PDF embedded font (sfnt) at offset 0x574A 4908 bytes
font_01_sfnt_off0000680c.bin
0e7cda285a025ea175c37f9966ac46f439406a3a968a29cca76f029d935219b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x680C 9980 bytes
font_02_sfnt_off00008a2c.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A2C 4324 bytes

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