Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e53d6858e555519…

MALICIOUS

PDF

41.2 KB Created: 2020-08-09 16:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb53c1d7ad6e5e83c7a4c312df86be48 SHA-1: a3877a3036b32f21bde582f8573412eada76c46d SHA-256: 5e53d6858e5555196e403b15e1d35c92b42a7d2f1b160da02cfd38f9140df063
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF that contains a large number of embedded links, many of which point to benign Shopify URLs, but one critical link directs to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to the malicious URL and other benign-looking PDF files, suggesting a link farm or redirection tactic.

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=worthy+is+the+lamb+pdf+chords
    • http://riteraris.amylouise-psychotherapy.co.uk/uploads/1/3/1/3/131383664/takin.pdf
    • http://files.desertdolphin.com/uploads/1/3/0/9/130969545/5304496.pdf
    • http://files.vcda2.com/uploads/1/3/2/6/132682030/lebepol-bitebado-sereji.pdf
    • http://files.willdeandesigns.com/uploads/1/3/1/4/131437421/6096577.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/asus_rt-_n66u.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/lobofuwuwegajupeb.pdf
    • https://cdn.shopify.com/s/files/1/0432/2010/7424/files/79285136702.pdf
    • https://cdn.shopify.com/s/files/1/0436/4979/4213/files/bejiwevepido.pdf
    • https://cdn.shopify.com/s/files/1/0432/3164/1762/files/32719475839.pdf
    • https://cdn.shopify.com/s/files/1/0435/1839/4523/files/28808095275.pdf
    • https://cdn.shopify.com/s/files/1/0433/2421/1354/files/76313730629.pdf
    • https://cdn.shopify.com/s/files/1/0429/5399/8489/files/60665730262.pdf
    • https://cdn.shopify.com/s/files/1/0439/2920/6939/files/makemkv_1._10._8_key.pdf
    • https://cdn.shopify.com/s/files/1/0432/9334/3912/files/32819437895.pdf
    • https://cdn.shopify.com/s/files/1/0428/5048/4390/files/nidavafixoj.pdf
    • https://cdn.shopify.com/s/files/1/0428/5153/2963/files/analytic_geometry_ellipse_problems_with_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8758/files/dides.pdf
    • https://cdn.shopify.com/s/files/1/0430/9748/9572/files/astm_a370_17a_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6063/3493/files/vapiwuxijopeligimepid.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_off00005483.bin
c1e49ab8152eb791e5e0603c01e911bcd1c81f76be5f1f8f1372f4e52fd492eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5483 5652 bytes
font_01_sfnt_off0000679c.bin
a06a8c14d68f7c6164483fbd7798d877c997cacc254323c70dd1b3ffafa16376		 pdf-font-stream PDF embedded font (sfnt) at offset 0x679C 14908 bytes

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