Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c28296b76440bdb…

MALICIOUS

PDF

41.3 KB Created: 2020-08-14 03:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0727b36dbe679c56accc14e390c19592 SHA-1: 7455fe2b7f2edbc255d16f0ecc691965a1cc056f SHA-256: 0c28296b76440bdbd808f9b749ecaaa5aafec90d181ca4cd1bae71f5d5b977ab
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically a URL related to 'transunion credit report status codes'. This, combined with the PDF SEO link farm heuristic and the ML classifier, strongly suggests a malicious intent to redirect users to a potentially harmful site. The document body, though heavily obfuscated, also contains the malicious URL, reinforcing the attack pattern.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.ru/pify?keyword=transunion+credit+report+status+codes
    • http://mefanisu.neddnews.com/uploads/1/3/1/1/131164250/9fb489ef2e947.pdf
    • http://wozepog.countertruth.com/uploads/1/3/2/8/132814930/zarewukenisaxe_mesabudipewe.pdf
    • http://files.familyfellowshipla.com/uploads/1/3/1/4/131453990/tutinuxo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/9244/2264/files/timuwuliziwirenu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3060/9063/files/morfologia_de_cestodos.pdf
    • https://cdn.shopify.com/s/files/1/0431/8294/8506/files/sulumopozekuf.pdf
    • https://cdn.shopify.com/s/files/1/0435/5699/5233/files/check_host_file_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0436/0624/5534/files/rogejodasozuk.pdf
    • https://cdn.shopify.com/s/files/1/0439/7488/5534/files/basel_1_2_3_indonesia.pdf
    • https://cdn.shopify.com/s/files/1/0432/2128/7080/files/carnival_of_venice_piano.pdf
    • https://cdn.shopify.com/s/files/1/0430/0151/2095/files/37334334080.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8106/files/kuvezaporulige.pdf
    • https://cdn.shopify.com/s/files/1/0429/9636/7511/files/mapa_geolgico_do_estado_da_bahia.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_off00006352.bin
26d1e36590714a15bb587fb7a13bbba4f7379ee68985df4a3654f3d666cb207e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6352 4984 bytes
font_01_sfnt_off00007448.bin
acc36c458948308a200ad61f01da09b3e26b39bd82ecb122f643c3a543729203		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7448 10576 bytes

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