Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de1f51d94050249…

MALICIOUS

PDF

40.1 KB Created: 2020-08-07 08:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63f2721866f5ce8197d47f2bb2043a29 SHA-1: 631095a77c544729cf3afffd8435fc3d26738133 SHA-256: 6de1f51d940502492200d5facfe9600b9327d4a484900dde1be54cbcbc1e4fe3
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=ankylosing+spondylitis+yoga+pdf', suggesting an attempt to trick users into visiting malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous links and the ML classifier's high confidence indicate a malicious intent.

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=ankylosing+spondylitis+yoga+pdf
    • http://files.hillneuroslp.com/uploads/1/3/0/7/130775432/41edeef4328d.pdf
    • http://files.titopools.com/uploads/1/3/0/7/130738803/492ca05eb92e8.pdf
    • http://files.cameroncarpenterdesign.com/uploads/1/3/2/6/132695278/5272073.pdf
    • http://files.countryweddingsatcrookedriverfarm.com/uploads/1/3/0/8/130814531/9903601.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0813/1233/files/balance_sheet_format.pdf
    • https://cdn.shopify.com/s/files/1/0437/7736/0029/files/73713392744.pdf
    • https://cdn.shopify.com/s/files/1/0434/5479/1832/files/pdf_file_resize_1_mb.pdf
    • https://cdn.shopify.com/s/files/1/0437/4754/1146/files/26635433802.pdf
    • https://cdn.shopify.com/s/files/1/0434/7727/0692/files/adjetivos_em_ingles_exercicios.pdf
    • https://cdn.shopify.com/s/files/1/0431/1882/1530/files/arap_bahar_ve_msr.pdf
    • https://cdn.shopify.com/s/files/1/0438/8116/9051/files/zijemovuminezipufe.pdf
    • https://cdn.shopify.com/s/files/1/0439/4388/7016/files/5353124991.pdf
    • https://cdn.shopify.com/s/files/1/0432/0939/2285/files/58332044383.pdf
    • https://cdn.shopify.com/s/files/1/0431/6299/2795/files/6390483808.pdf
    • https://cdn.shopify.com/s/files/1/0432/1758/4285/files/79232151975.pdf
    • https://cdn.shopify.com/s/files/1/0437/8296/3349/files/xisikepoxamefazebijav.pdf
    • https://cdn.shopify.com/s/files/1/0432/5477/5970/files/fidasojiritowogakiperirev.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_off00005f5e.bin
bf3ad2c137de40e1e3601509483d6ff28c5163891f446b9ce528ab131328cbae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F5E 5268 bytes
font_01_sfnt_off00007177.bin
8448ed2713de2a4d64ff546253b0edae04f3ace840ca018942280a14df873f70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7177 9964 bytes

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