Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a75ceb1f5c7a5c…

MALICIOUS

PDF

50.2 KB Created: 2020-08-05 23:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1697741c3bdb3ce4ea97a5271e2a2eca SHA-1: 880f2faf30f1e73a86ab2344a10dbbd098797fce SHA-256: c9a75ceb1f5c7a5cc6cedd339cd98c8449543825a6b497eeff847dc1dafd597d
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=arranged+marriage+vs+love+marriage+debate+pdf'. This indicates an attempt to redirect the user to a potentially harmful site. Additionally, the PDF exhibits characteristics of a link farm, with numerous external links, many pointing to Shopify domains, suggesting an effort to obscure the true destination or leverage legitimate platforms for malicious purposes. The ML classifier also strongly flagged this PDF as malicious.

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=arranged+marriage+vs+love+marriage+debate+pdf
    • http://files.nikkieartistry.com/uploads/1/3/0/9/130969334/5201055.pdf
    • http://files.cupcake-couture.net/uploads/1/3/0/7/130739227/4627659.pdf
    • http://files.widenelementary.org/uploads/1/3/1/8/131871852/wumenanawusom.pdf
    • https://cdn.shopify.com/s/files/1/0434/1914/0253/files/38882655242.pdf
    • https://cdn.shopify.com/s/files/1/0430/6901/4165/files/abhishek_kumar_pandey_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/7496/1059/files/bu_admission_circular_2020_20.pdf
    • https://cdn.shopify.com/s/files/1/0431/9802/1793/files/kinadenanigulusipafebafu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/duliwoledemovaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0810/files/junifiregemijojazarelo.pdf
    • https://cdn.shopify.com/s/files/1/0437/1723/0741/files/c_max_heap.pdf
    • https://cdn.shopify.com/s/files/1/0432/9639/1323/files/10291961580.pdf
    • https://cdn.shopify.com/s/files/1/0431/5345/7320/files/vokezenazunozegi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7142/2102/files/62837544958.pdf
    • https://cdn.shopify.com/s/files/1/0430/2408/9242/files/denukuzujofil.pdf
    • https://cdn.shopify.com/s/files/1/0447/3815/0549/files/oxford_bookworms_stage_3_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3106/files/mebijotiw.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_off00006ef1.bin
07dbd930912ce407917b7c1ea7333b80c36404171afd09cb64f3729f8ba2bbf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EF1 5548 bytes
font_01_sfnt_off000081bb.bin
ba820bc077d1494082523e9831a33e0a24973de9d9342e62609b0e3abcbd3672		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81BB 10304 bytes
font_02_sfnt_off0000a527.bin
92ca5277a07040a1118e6ffe557fff1b4332eaf15e577e4df2dfa25513d903e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA527 16336 bytes

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