Malicious PDF — malware analysis report

Static analysis result for SHA-256 758d6063d580d8d9…

MALICIOUS

PDF

48.7 KB Created: 2020-07-13 04:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d407c943c6362d6ccddb7803621fab0a SHA-1: 1a1a0a50a1487bb4f67079ae72724ff12799fd5c SHA-256: 758d6063d580d8d9b3a8837f88b1bf504e6b281b25f209ebc26b010bca88fe57
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of the primary links redirects to a known malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its specific lure, but the extensive link farm and malicious redirector strongly suggest an attempt to drive traffic to malicious sites, potentially for phishing or SEO poisoning.

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/wb?keyword=numerical%20integration%20solved%20problems%20pdf
    • http://files.robynshaw.net/uploads/1/3/2/6/132695465/tokefadi-matatu.pdf
    • http://files.artandroulla.com/uploads/1/3/1/3/131380773/6e51b943ebb202b.pdf
    • http://files.burnswharf.net/uploads/1/3/1/6/131606819/lofufitamo-putoruxarop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1602/8309/files/tigexafefapasitejugesixo.pdf
    • https://cdn.shopify.com/s/files/1/0428/6483/6764/files/wigizotigutavizolagot.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5684/files/benebinufuzuwak.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bewewolifokolugetu.pdf
    • https://poguzotu.files.wordpress.com/2020/07/53814443953.pdf
    • https://jinejejinuku.files.wordpress.com/2020/07/jidekarevirofuwewabodur.pdf
    • https://zuzilunox.files.wordpress.com/2020/06/wojidus.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kilezolesosobusafo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56346524494.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51098187394.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/peweradenazeranogivik.pdf
    • https://cdn.shopify.com/s/files/1/0430/2385/9873/files/wavenuzumeruxago.pdf
    • https://cdn.shopify.com/s/files/1/0431/8658/5749/files/demapiruxiwegonigiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/2745/5400/files/betibezebogamupod.pdf
    • https://cdn.shopify.com/s/files/1/0431/1724/8672/files/lagobebewaborovivoku.pdf
    • https://cdn.shopify.com/s/files/1/0433/3866/2053/files/sukubof.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_off000075ab.bin
d541e497b5003627b704c7979084b8b77d0e79b6d1b4050a2f86cbcac322dcbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75AB 5524 bytes
font_01_sfnt_off0000885a.bin
c46d109c870c3e4b71ca4801ce0e0e71c87ccd7e85ab695c3c07763f06a62412		 pdf-font-stream PDF embedded font (sfnt) at offset 0x885A 14184 bytes

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