Malicious PDF — malware analysis report

Static analysis result for SHA-256 760107b007142132…

MALICIOUS

PDF

37.6 KB Created: 2020-08-20 02:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffb7567e9601770bd4c21407a2c99ecc SHA-1: f35402b747107e84354a5b975fa09e323e03242d SHA-256: 760107b007142132f60390f6dfbf9ca278da4c2c0e392d973d625a40624a2036
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body appears to be obfuscated or corrupted, but the presence of numerous links suggests a link farm or redirection attack. The primary IOC is the malicious redirector URL.

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=gubbi+mele+brahmastra+kannada+movie
    • http://files.khatso.net/uploads/1/3/1/3/131381782/mozunusapirav-poderopaga-sovilamupoki-zikopoponexe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/6617/0271/files/18024840504.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/17075378572.pdf
    • https://cdn.shopify.com/s/files/1/0428/2076/3804/files/nunokenavo.pdf
    • https://cdn.shopify.com/s/files/1/0429/0261/8278/files/loxewigumi.pdf
    • https://cdn.shopify.com/s/files/1/0438/2805/2130/files/4681116136.pdf
    • https://cdn.shopify.com/s/files/1/0428/2961/1171/files/49945393333.pdf
    • https://cdn.shopify.com/s/files/1/0428/5969/2191/files/zulufelodovovujiwadodamez.pdf
    • https://cdn.shopify.com/s/files/1/0431/4424/9499/files/tizovesapejozoka.pdf
    • https://cdn.shopify.com/s/files/1/0434/1520/8098/files/gary_hood_auto_clicker.pdf
    • https://cdn.shopify.com/s/files/1/0440/5982/0182/files/moffett_forklift_parts_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/0743/3125/files/82449351141.pdf
    • https://cdn.shopify.com/s/files/1/0432/1568/3743/files/wetuwajotanunagofu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6001/0906/files/sotekajezotudilitupam.pdf
    • https://cdn.shopify.com/s/files/1/0433/6150/1334/files/bigekena.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005497.bin
d7a3cd394168959250b5ccdd25a1b8fde122a308d3d5f97bdeacdb3b7a50ebbf
pdf-font-stream PDF embedded font (sfnt) at offset 0x5497 5360 bytes
font_01_sfnt_off000066ab.bin
65c2f85ad073c981e765f3075eee6996fef4a8b73455219ea31236d6c548cdce
pdf-font-stream PDF embedded font (sfnt) at offset 0x66AB 10156 bytes