Malicious PDF — malware analysis report

Static analysis result for SHA-256 02ff76bf1a573b36…

MALICIOUS

PDF

59.1 KB Created: 2020-08-08 18:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2e74b48b9863e57c1086ab627f55efd SHA-1: 0c872c02e46647dea3eb271eb00618d946df21f1 SHA-256: 02ff76bf1a573b36dbf1d13b33eeb3e23714e0b76bfd607f28c2bd1bf66ab532
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, suggesting a link farm or SEO poisoning attempt. The primary link directs to a known malicious redirector infrastructure. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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=applied+mathematics+1+rd+sharma+pdf
    • http://files.dempseyandwindle.com/uploads/1/3/0/7/130775970/5303147.pdf
    • http://files.alisonweatherly.com/uploads/1/3/2/6/132682640/6526889.pdf
    • http://files.sallyshaw.com.au/uploads/1/3/1/4/131407086/700952.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0595/9574/files/bogopamupadi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5040/0928/files/gipilipewuda.pdf
    • https://cdn.shopify.com/s/files/1/0439/2199/7979/files/pogufijaliwuvuxeso.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gomejalubewetilukifij.pdf
    • https://cdn.shopify.com/s/files/1/0430/9912/7957/files/88817279788.pdf
    • https://cdn.shopify.com/s/files/1/0434/0557/4309/files/vatinasexosewuzedifuparu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3037/1738/files/fizasivaluveziluje.pdf
    • https://cdn.shopify.com/s/files/1/0427/8855/2870/files/php_sort_array_by_key.pdf
    • https://cdn.shopify.com/s/files/1/0438/8729/6680/files/wapulanugirikux.pdf
    • https://cdn.shopify.com/s/files/1/0435/5093/3155/files/drosophila_mutations.pdf
    • https://cdn.shopify.com/s/files/1/0428/9665/4499/files/kaniletilajoki.pdf
    • https://cdn.shopify.com/s/files/1/0434/6871/8242/files/digimon_world_dusk_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0430/7379/8298/files/dufagiriledimivikotusa.pdf
    • https://cdn.shopify.com/s/files/1/0439/4303/5048/files/princess_mononoke_soundtrack.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_off00009d10.bin
98ea1f5e9a3cac05f6bd03caf3324c3c7c8d5015da931ce4ded47b3757d3116b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D10 5008 bytes
font_01_sfnt_off0000ae11.bin
d3808ae15e4916a7ff176625c438c47351415c37e4f3ba8d2c8f56a46c0a98fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE11 10248 bytes
font_02_sfnt_off0000d0f0.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F0 4324 bytes

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