Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aa76df23dfc452d…

MALICIOUS

PDF

55.8 KB Created: 2020-08-31 03:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcef37a2c4d005e484bad25718a67889 SHA-1: 29db3c846b8f4d73bc024b8dc112f5a8e153518f SHA-256: 2aa76df23dfc452dcc136ad35bcbdfaf088046712712565ab486ae7c6750c30c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=photoshop+inverser+noir+et+blanc'. The document body, though heavily obfuscated, appears to contain this URL and other benign-looking PDF links, suggesting a lure to a malicious site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the primary malicious activity appears to be redirection.

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.cc/wix?keyword=photoshop+inverser+noir+et+blanc
    • https://static.usrfiles.com/ugd/be19e1_b1609265357a463c861c922788ef5fca.pdf
    • https://static.usrfiles.com/ugd/f0e51d_2c7b0e817f2c4154bd2bd254db66b3a1.pdf
    • https://static.usrfiles.com/ugd/b8c837_46a55330e7064069b522c10be6581866.pdf
    • https://static.usrfiles.com/ugd/99965f_f15bc015f6ca484e9f417a1d5b4d9f77.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8179/files/lifijixenetawizotog.pdf
    • https://cdn.shopify.com/s/files/1/0461/6821/1608/files/university_of_the_assumption_college_uniform.pdf
    • https://cdn.shopify.com/s/files/1/0440/7659/7413/files/nopofifovaxitasufe.pdf
    • https://cdn.shopify.com/s/files/1/0435/5037/6100/files/91371337214.pdf
    • https://cdn.shopify.com/s/files/1/0430/2887/3367/files/the_johns_hopkins_absite_review_manual_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/8333/3786/files/xorugus.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/949986333.pdf
    • https://cdn.shopify.com/s/files/1/0431/8360/3873/files/zigizaditerikunum.pdf
    • https://cdn.shopify.com/s/files/1/0452/6276/6242/files/acknowledgement_in_technical_report.pdf
    • https://cdn.shopify.com/s/files/1/0437/9725/0205/files/80765007850.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_off00009033.bin
c69c6d06839038ee14cbdc153d86957c4d0e1c680d357a175788365c5a779e55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9033 5220 bytes
font_01_sfnt_off0000a1e0.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1E0 1800 bytes
font_02_sfnt_off0000aa6d.bin
6a5cbb398dda7bc989a7e709f331abcf00b0b2e114c4228d1984e5f6b65ca4a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA6D 12296 bytes

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