Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d033bdbad5dfc18…

MALICIOUS

PDF

49.4 KB Created: 2020-08-14 23:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c3fe5f1159839030d3bb8e43faa1005 SHA-1: e29b139fedea82e381af48d81be31af1e159e7d4 SHA-256: 3d033bdbad5dfc18d91d2ccec05f889d68947a87c0baca323be5ae05f1ebc684
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text that appears to be a lure for a worksheet. The ML classifier strongly flagged this PDF as malicious. The primary IOC is the redirector URL, which is likely used to serve further malicious content.

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/wb?keyword=successes%20of%20the%20civil%20rights%20movement%20worksheet
    • http://tojegiz.catholic-teaching-alliance.org/uploads/1/3/1/6/131606343/960990.pdf
    • http://files.missionographer.com/uploads/1/3/0/8/130814907/jujelizulejotus.pdf
    • http://files.fortmyerthriftshop.org/uploads/1/3/1/4/131452958/52876aec.pdf
    • http://pugil.orderalaminute.com/uploads/1/3/2/8/132814930/juwosok-rimixufusa-pajadix.pdf
    • https://cdn.shopify.com/s/files/1/0432/8076/0990/files/dogamesa.pdf
    • https://cdn.shopify.com/s/files/1/0432/5041/7827/files/8041585268.pdf
    • https://cdn.shopify.com/s/files/1/0428/1827/3446/files/34396669682.pdf
    • https://cdn.shopify.com/s/files/1/0429/8987/9445/files/36836725085.pdf
    • https://cdn.shopify.com/s/files/1/0447/9657/5904/files/rotuwavoxudulakididifib.pdf
    • https://cdn.shopify.com/s/files/1/0440/6404/7269/files/string_art_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/minecraft_pe_0._12._1_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/9131/2288/files/26291990117.pdf
    • https://cdn.shopify.com/s/files/1/0438/0291/9074/files/java_ssl_debug.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f90.bin
4664d494959a5f5d2060c407ad07c2159631d148b3ba210e10f552ea1b3beb0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F90 5288 bytes
font_01_sfnt_off0000716f.bin
ba25b06953692855ee6c3ff0770afaa73d9de17ed411509b2805b01e8e459d2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x716F 10192 bytes
font_02_sfnt_off00009481.bin
975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9481 16312 bytes
font_03_sfnt_off0000aa0c.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA0C 4324 bytes

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