Malicious PDF — malware analysis report

Static analysis result for SHA-256 aefa85ef81808417…

MALICIOUS

PDF

44.1 KB Created: 2020-08-11 09:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1217ccc17b9ca2f38501b73795824af1 SHA-1: 41442f936b3944b5b48ae6ab66703bd01ff9fd10 SHA-256: aefa85ef81808417703835f1c78737572fde548c885056eb46bc062a4a1d2f6b
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific redirector URL that is flagged as malicious. The document body, though heavily obfuscated, contains text related to the lure and the redirector URL. The primary attack pattern involves tricking the user into clicking a link that leads to malicious infrastructure, likely for further exploitation or phishing. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=africa+political+map+pdf+free+download
    • http://files.kanafanimarmi.com/uploads/1/3/1/3/131398197/lopikija-likiveliriweve-viresipokigot.pdf
    • http://files.n-cbt.com/uploads/1/3/0/7/130776363/65a3cf13a9d005.pdf
    • http://files.yannispizzeriadeerfield.com/uploads/1/3/0/7/130775297/fesare.pdf
    • https://cdn.shopify.com/s/files/1/0440/4376/3862/files/50917296587.pdf
    • https://cdn.shopify.com/s/files/1/0429/6821/9799/files/nurodevetonupejuva.pdf
    • https://cdn.shopify.com/s/files/1/0434/6213/1869/files/4246814303.pdf
    • https://cdn.shopify.com/s/files/1/0434/6370/4729/files/college_essay_examples.pdf
    • https://cdn.shopify.com/s/files/1/0434/0894/9402/files/probability_and_statistics_for_engineers_and_scientists_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0432/8960/8360/files/gumig.pdf
    • https://cdn.shopify.com/s/files/1/0438/4745/0774/files/mysql_workbench_reference_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/9898/8949/files/5572890034.pdf
    • https://cdn.shopify.com/s/files/1/0432/9593/2584/files/36027902945.pdf
    • https://cdn.shopify.com/s/files/1/0429/9712/1178/files/nibivogaropopow.pdf
    • https://cdn.shopify.com/s/files/1/0428/3770/4867/files/36965502525.pdf
    • https://cdn.shopify.com/s/files/1/0440/8341/3142/files/algebra_2_student_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8584587797.pdf
    • https://cdn.shopify.com/s/files/1/0431/0525/5586/files/adobe_illustrator_create_editable.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d47.bin
4e2a8143a3d6fda468b43797f68f7bc5b97a8743e2adbf3fdf383299531b0149		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D47 5204 bytes
font_01_sfnt_off00007eee.bin
13fb1898f2a37c13eef3b40d9bce347a7d12fdc9d66f7c833f331fac2266f1a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EEE 10636 bytes

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