Malicious PDF — malware analysis report

Static analysis result for SHA-256 78233d2e4dad51d2…

MALICIOUS

PDF

57.1 KB Created: 2020-08-06 14:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2789bfc7cfad6ae0f7873fb22c894fdd SHA-1: 40899c3b787b3a6880d59dec18d72577f3c4e16a SHA-256: 78233d2e4dad51d284e47ce9b212ece24fca6ad7539425bf278bab09302c9736
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to known malicious redirector infrastructure. The document body itself contains obfuscated text and references to URLs, suggesting an attempt to direct users to malicious sites for further exploitation. The ML classifier also strongly indicated maliciousness.

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=la+science+cabalistique+pdf
    • http://files.longchronicles.com/uploads/1/3/0/7/130776503/2426798.pdf
    • http://files.t-wallsofjointbasebalad.com/uploads/1/3/1/3/131380063/buvib.pdf
    • http://xoxekal.timelineethiopia.com/uploads/1/3/1/4/131408024/cf42697da21c8f1.pdf
    • http://regamevi.ellyx.studio/uploads/1/3/1/6/131606727/pugasosojir_zopologovob_pesivugowaru.pdf
    • http://files.bluebonnetshophop.net/uploads/1/3/1/4/131452958/duxekari-vakilemixes-jigep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2200/0029/files/91347069890.pdf
    • https://cdn.shopify.com/s/files/1/0436/9648/8613/files/99004083328.pdf
    • https://cdn.shopify.com/s/files/1/0437/1510/0822/files/76065040822.pdf
    • https://cdn.shopify.com/s/files/1/0433/8640/5029/files/hip_to_the_javabean.pdf
    • https://cdn.shopify.com/s/files/1/0432/9675/1774/files/powabola.pdf
    • https://cdn.shopify.com/s/files/1/0435/5224/3861/files/clicker_heroes_ruby_cheat.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tugerivedisabuv.pdf
    • https://cdn.shopify.com/s/files/1/0428/0818/0895/files/herculine_barbin.pdf
    • https://cdn.shopify.com/s/files/1/0440/0644/1110/files/statistics_for_life_sciences_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/7881/1810/files/automotive_technology_4th_edition_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/6559/6321/files/tuwamonenopeferibebiris.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_off0000a2b4.bin
133538736e1f1e0ce8b6bb74b0e4b78000bd1c21e52692317d577c986ceac538		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2B4 5260 bytes
font_01_sfnt_off0000b4aa.bin
de33b18f020fa3254779f81ef65bf392189b4fc8d69c2887c2219eb5ecd3b3e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4AA 10144 bytes

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