Malicious PDF — malware analysis report

Static analysis result for SHA-256 66cfea7729fe0a61…

MALICIOUS

PDF

56.4 KB Created: 2020-08-17 00:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4af38bbf0e70e77c62ec07122432220 SHA-1: 12bec9dab2f5299caaec25acc67c15ed010ac9c7 SHA-256: 66cfea7729fe0a617b6148a9ab2e66307300572589ae6c2cd33edc5e665c02ee
174 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a "math solver with steps apk". The document also contains a large number of embedded links, many pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attempt, likely to deliver a secondary payload.

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=math+solver+with+steps+apk
    • http://files.newbeginningsintuitive.com/uploads/1/3/0/7/130774964/lamif.pdf
    • http://files.wrladyhornets.com/uploads/1/3/0/8/130814351/birejukuge.pdf
    • http://files.anthonylaurienti.com/uploads/1/3/0/7/130738725/towubotize.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://cdn.shopify.com/s/files/1/0430/8012/2532/files/wolenoj.pdf
    • https://cdn.shopify.com/s/files/1/0440/2656/0677/files/11853853154.pdf
    • https://cdn.shopify.com/s/files/1/0432/0375/6196/files/32728848170.pdf
    • https://cdn.shopify.com/s/files/1/0448/5254/3649/files/mac_missing_xcrun.pdf
    • https://cdn.shopify.com/s/files/1/0428/9986/5756/files/87477486447.pdf
    • https://cdn.shopify.com/s/files/1/0432/9422/8630/files/33632517680.pdf
    • https://cdn.shopify.com/s/files/1/0430/8919/9268/files/garesuriranito.pdf
    • https://cdn.shopify.com/s/files/1/0451/6826/3317/files/genetic_algorithm_filetype.pdf
    • https://cdn.shopify.com/s/files/1/0434/5430/0327/files/44986460587.pdf
    • https://cdn.shopify.com/s/files/1/0436/4396/1504/files/vusafadenafilesug.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
    • http://www.gnu.org/licenses/gpl.html
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f0f.bin
6fa9fdbdf7fecf168fc1c39ee9cc8860b0a1a5a68518fe9f4f75bc9df002051c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F0F 5128 bytes
font_01_sfnt_off0000708f.bin
2b0241898a6eadc7d430edd7eabb6e4cabc09689812b08bb3c6d075ae023a393		 pdf-font-stream PDF embedded font (sfnt) at offset 0x708F 1924 bytes
font_02_sfnt_off000079b1.bin
42189451c4a29baf54b7cf8def07d027d2fd4ef5daf54f0d01a8cd7bc89f6607		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79B1 10668 bytes
font_03_sfnt_off000097a1.bin
d618cae0fea862f16f70fde6c8cc5421ff5ab5d902dc01e3de526fb48d957725		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97A1 10268 bytes
font_04_sfnt_off0000badc.bin
7a344eb4d613886cef89f796561cb6c0c61bcc9bc854668344b98d8765ce9e27		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBADC 17148 bytes

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