Malicious PDF — malware analysis report

Static analysis result for SHA-256 187b798f89149d09…

MALICIOUS

PDF

70.3 KB Created: 2020-07-30 15:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77c19225efe4a6c37aa6854021ef7597 SHA-1: 49d47ab021877b400b36f650c649dc48e7ce11c2 SHA-256: 187b798f89149d092d26355f60d4bd3196c7d56a3f77e7fd551fe3aaeabce3a8
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to external PDF files hosted on various domains, including a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a coordinated effort to distribute content through a link farm. The ML classifier also strongly suggests maliciousness. While no scripts were explicitly extracted, the structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=meconium+aspiration+syndrome+%25E0%25B8%2584%25E0%25B8%25B7%25E0%25B8%25AD+pdf
    • http://files.monfortestatesdacula.com/uploads/1/3/2/6/132681002/226bb98.pdf
    • http://files.hwdecelocal.com/uploads/1/3/1/6/131606127/7318373.pdf
    • http://files.gardenclubofthemiddlepeninsula.com/uploads/1/3/0/7/130739525/jedigexu-disuwis-japixubadakuk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/niwaragevutaxesidep.pdf
    • https://cdn.shopify.com/s/files/1/0435/2180/2392/files/fovosotodugobuwuwa.pdf
    • https://cdn.shopify.com/s/files/1/0439/7118/2750/files/nivojurilodedifipow.pdf
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/24397899468.pdf
    • https://cdn.shopify.com/s/files/1/0431/4628/1121/files/gitepifum.pdf
    • https://cdn.shopify.com/s/files/1/0431/6299/2795/files/23745465774.pdf
    • https://cdn.shopify.com/s/files/1/0430/7920/5031/files/26735333032.pdf
    • https://cdn.shopify.com/s/files/1/0434/3706/4348/files/92194153401.pdf
    • https://cdn.shopify.com/s/files/1/0430/9748/9572/files/lakidedenarebebiruromal.pdf
    • https://cdn.shopify.com/s/files/1/0431/6400/8610/files/36296145313.pdf
    • https://cdn.shopify.com/s/files/1/0434/1704/3111/files/dubosowe.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
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b420.bin
f39342845f972fb36f4d0da0330f8a053128c194dda7579c1490edee72b98ff4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB420 5260 bytes
font_01_sfnt_off0000c5e4.bin
96a6b1aca62ce964ce1a7f0f1d699b36a218f8ea7d340becdfd918ff57d46c02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E4 6180 bytes
font_02_sfnt_off0000d5e1.bin
58b4873d33ac9fffaf45ed1a2312b8eb5fadf3b067e77f8cfe9e87095f6a7717		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E1 6068 bytes
font_03_sfnt_off0000e592.bin
33a2555acef80c83915b66e2c2e992d4919c53e10b4f6206c23ca01ed69eafe0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE592 10344 bytes

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