Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cef597f4a3f02df…

MALICIOUS

PDF

44.8 KB Created: 2020-08-11 01:40:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a106f89ae527d534589f10d571788c7 SHA-1: 44790ce1b9f41aea2ee8fe807f874f1d668968ef SHA-256: 0cef597f4a3f02df9727df1dccb25e8568260b970d09cd495d13261e3b1020d2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting PDF files, but one critical link redirects to a known malicious domain (ttraff.com). This suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to a malicious redirector.

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.com/pify?keyword=esllibrary.+com+grammar+practice+worksheets+pdf
    • http://files.creativconcepts.studio/uploads/1/3/1/0/131069819/9245563.pdf
    • http://files.glogodsloveonly.com/uploads/1/3/0/8/130874023/5919930.pdf
    • http://files.glogodsloveonly.com/uploads/1/3/1/4/131407511/regugasibovuzazubozi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0441/1061/0584/files/calligraphy_handwriting_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/9906/2421/files/tikiwosudesev.pdf
    • https://cdn.shopify.com/s/files/1/0432/5706/9721/files/66019362092.pdf
    • https://cdn.shopify.com/s/files/1/0428/7417/5644/files/capacitive_touch_sensor.pdf
    • https://cdn.shopify.com/s/files/1/0432/6785/0390/files/zegagik.pdf
    • https://cdn.shopify.com/s/files/1/0429/5317/9289/files/aptitude_questions_on_percentage.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/65438895007.pdf
    • https://cdn.shopify.com/s/files/1/0452/7741/3538/files/ponikubuwezuxavi.pdf
    • https://cdn.shopify.com/s/files/1/0434/7474/7545/files/isometric_grid_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mekokagowofulagifofid.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005725.bin
964d1b0d145ff91a8a57d62b2f0d442ae7ca8e65387a659b344d388129864796		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5725 5956 bytes
font_01_sfnt_off00006b56.bin
6a434698278260c995f4f8c21ecb08659254805a8e98aa0dc876d4d1f06a0677		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B56 10212 bytes
font_02_sfnt_off00008e6a.bin
1c8bc4bf779fdf5fdd428ab6ddc6a1665d3fdc1c26b4364692bd94c1ed605b78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E6A 16364 bytes

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