Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1db828f0eb97509…

MALICIOUS

PDF

49.1 KB Created: 2020-08-13 20:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0aa31a1a760d260c44de4b24f1efdaf SHA-1: 55cbfa08fea690022af584c3df314bac0e6f0ddd SHA-256: e1db828f0eb97509cf289c5cfb3881209ca2c97ea721dfd0b7cdff81886e39ab
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors, such as ttraff.com. The document body, though partially corrupted, includes text suggesting a lure related to educational materials, and the primary malicious URL is explicitly present. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a link to known malicious infrastructure.

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/wb?keyword=class%2010%20social%20science%20lab%20manual%20solution
    • http://xowuzop.nqta.org/uploads/1/3/2/6/132683286/883986.pdf
    • http://files.holytrinityberlin.org/uploads/1/3/1/0/131069812/5a0b3.pdf
    • http://files.onemetropolitansquare.com/uploads/1/3/1/4/131454012/junaxas.pdf
    • http://files.alliancemasonryrestoration.com/uploads/1/3/1/1/131163733/1405122.pdf
    • http://files.melissashowers.com/uploads/1/3/2/7/132740399/1333731.pdf
    • https://cdn.shopify.com/s/files/1/0430/0288/8351/files/muruzowutuzaka.pdf
    • https://cdn.shopify.com/s/files/1/0431/7826/2692/files/xuzajurelinurasopu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9373/7118/files/balopanesut.pdf
    • https://cdn.shopify.com/s/files/1/0428/9141/1615/files/daydreamin_lupe_fiasco.pdf
    • https://cdn.shopify.com/s/files/1/0435/3291/0751/files/musunux.pdf
    • https://cdn.shopify.com/s/files/1/0430/7202/8823/files/42865275471.pdf
    • https://cdn.shopify.com/s/files/1/0430/8421/8532/files/wifugovadosubek.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/best_english_learning_books.pdf
    • https://cdn.shopify.com/s/files/1/0440/3144/3094/files/gitupijuretadadesi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7791/7085/files/aristoteles_y_dante_gratis.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ab2.bin
5e5b2bba96ecacb1d9be9f1543847ef20af0ff5670d83cc377e9b723e090baee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB2 5088 bytes
font_01_sfnt_off00007be5.bin
cc44f5c2a347246900d1a47f16642b3f0f9e832053eec8dcb1b678fb3aed67d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BE5 11236 bytes
font_02_sfnt_off0000a22d.bin
bcfecb9fde4b74e4a2b692e15caf305b2988a1cfe4c6386614002e38d35feb86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA22D 16168 bytes

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