Malicious PDF — malware analysis report

Static analysis result for SHA-256 14b403b100a98909…

MALICIOUS

PDF

46.5 KB Created: 2020-08-08 19:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35638e14ef386d880a50c49d8035ac36 SHA-1: 37e6cf0d658a5d1de23ad7936cec860dad8fae0e SHA-256: 14b403b100a98909dd46ed8f0f6faf034b6828bd3a62b16791a5081868c1d069
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to external PDF files, which is indicative of a link farm or SEO manipulation tactic. One of the primary links, 'https://ttraff.com/pify?keyword=libros+abraham+maslow+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document's purpose is to redirect users to malicious sites, potentially for phishing or malware distribution.

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.com/pify?keyword=libros+abraham+maslow+pdf
    • http://files.janansiam.com/uploads/1/3/0/7/130739069/ritugixiduwev-xitoxid-pipatasituxur-bivaviw.pdf
    • http://tonov.visionkeeperart.com/uploads/1/3/2/6/132681556/02ce955d77151b.pdf
    • http://files.hawaiis1000friends.org/uploads/1/3/2/8/132814303/niwuvemokowavuri.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5840/5275/files/30812905488.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/jspdf_autotable_header_border.pdf
    • https://cdn.shopify.com/s/files/1/0438/4119/2101/files/nenirirug.pdf
    • https://cdn.shopify.com/s/files/1/0433/5671/7205/files/31512624791.pdf
    • https://cdn.shopify.com/s/files/1/0429/9125/5713/files/zuwed.pdf
    • https://cdn.shopify.com/s/files/1/0433/9925/0072/files/14895717162.pdf
    • https://cdn.shopify.com/s/files/1/0428/0611/6511/files/vufemoposire.pdf
    • https://cdn.shopify.com/s/files/1/0434/7897/4616/files/i_walked_across_an_empty_land.pdf
    • https://cdn.shopify.com/s/files/1/0429/6612/2662/files/68566106396.pdf
    • https://cdn.shopify.com/s/files/1/0427/8992/9116/files/vixaxexozif.pdf
    • https://cdn.shopify.com/s/files/1/0432/5271/1586/files/37204955454.pdf
    • https://cdn.shopify.com/s/files/1/0429/9417/2058/files/95511350925.pdf
    • https://cdn.shopify.com/s/files/1/0435/3340/2266/files/dilabusufipew.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_off000077b0.bin
64dba1ce56d0cbdadfd54590dd3271f3d960c8df023731bc425a503a2cd98d02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77B0 5452 bytes
font_01_sfnt_off00008a1e.bin
409efe9c61796a7702f16acacc5d70c24b06c3cafed05ae2b21d2aeab991ad40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A1E 10176 bytes

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