Malicious PDF — malware analysis report

Static analysis result for SHA-256 11e2838c93088fbd…

MALICIOUS

PDF

44.4 KB Created: 2020-08-29 17:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d688c453d719f34af4b6a62a828f168c SHA-1: 677a5fd0c295f5504e2e8843534aab4d42ccdaf9 SHA-256: 11e2838c93088fbd3c4476d1805a6d10a1fe5b52ebfde7451e83c315850a81f3
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lure users into downloading further malicious content. The document body also contains a large number of links to external PDFs, suggesting a link farm intended to improve SEO for malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.cc/wix?keyword=acc+g+suit+download+acc
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_735c6288f6dc435e9ebd8326560b260d.pdf
    • https://static.usrfiles.com/ugd/b8c837_07d2ac8a94c74a2587d872b3ca4f266b.pdf
    • https://static.usrfiles.com/ugd/b77b08_bdd211c749cf4d03a25fefe0706a1bef.pdf
    • https://static.usrfiles.com/ugd/b8c837_0dd0570dae5c4c2e9554067085331ac9.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b1a633001ce4af7bdc2582769e90779.pdf
    • https://cdn.shopify.com/s/files/1/0462/2883/2405/files/apple_spreadsheet_for_ipad.pdf
    • https://cdn.shopify.com/s/files/1/0433/2349/0457/files/wukumadavofezame.pdf
    • https://cdn.shopify.com/s/files/1/0437/9967/5040/files/22244389677.pdf
    • https://cdn.shopify.com/s/files/1/0430/7389/6602/files/english_dictionary_free_download_for_mobile.pdf
    • https://cdn.shopify.com/s/files/1/0433/0966/2366/files/37456998966.pdf
    • https://cdn.shopify.com/s/files/1/0434/0842/5116/files/information_on_bone_cancer_stages.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/52934379195.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_off00006329.bin
771b951dd504f3ecd217d4d2d153830442c2a6b8f81e2a63b92c44de3f61a4ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6329 4856 bytes
font_01_sfnt_off000073c6.bin
667ded4b4494a68d320bd9501c7ddebe6e3b8e474c29aebfc9ae8f018fb95d33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73C6 10216 bytes
font_02_sfnt_off000096cd.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96CD 4324 bytes

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