Malicious PDF — malware analysis report

Static analysis result for SHA-256 140b8eca8359d252…

MALICIOUS

PDF

45.8 KB Created: 2020-07-29 10:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4687d171e309ba2672a990c5b4d82d62 SHA-1: 08c8335bfd679421daa4a66e5bf9780fb6d762b2 SHA-256: 140b8eca8359d25222420c005595b91047c4c34088b2ba420a203ade27ee220c
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, appears to be a lure for exam questions, suggesting a phishing or scam attempt. The presence of numerous external PDF links also indicates a link farm, likely for SEO manipulation or to host further malicious content.

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/pify?keyword=descargar+preguntas+ser+bachiller+2020+pdf
    • http://files.jade-french.com/uploads/1/3/0/7/130775465/gulonidexalig.pdf
    • http://files.tinmanlifecoaching.com/uploads/1/3/0/7/130740127/zotukixojewem.pdf
    • http://files.naparegionaldance.com/uploads/1/3/1/6/131606876/wudabifawakinezometi.pdf
    • http://files.anxietyannarbor.com/uploads/1/3/0/7/130738799/jadivinaxivafu-savavapasofobet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7990/1096/files/7564297265.pdf
    • https://cdn.shopify.com/s/files/1/0430/2631/7473/files/35482780165.pdf
    • https://cdn.shopify.com/s/files/1/0428/2076/3804/files/deneleguguboxa.pdf
    • https://cdn.shopify.com/s/files/1/0432/9861/9550/files/88392355677.pdf
    • https://cdn.shopify.com/s/files/1/0431/4624/8358/files/tanixazokosuwavej.pdf
    • https://cdn.shopify.com/s/files/1/0431/9834/9471/files/rigux.pdf
    • https://cdn.shopify.com/s/files/1/0434/6927/5286/files/66447312409.pdf
    • https://cdn.shopify.com/s/files/1/0435/3182/9412/files/96518610423.pdf
    • https://cdn.shopify.com/s/files/1/0436/1961/4882/files/buzidarodesi.pdf
    • https://cdn.shopify.com/s/files/1/0429/3001/2316/files/manusupebufiveta.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/telisupuf.pdf
    • https://cdn.shopify.com/s/files/1/0437/3384/4119/files/38190087182.pdf
    • https://cdn.shopify.com/s/files/1/0431/7777/1162/files/69595893696.pdf
    • https://cdn.shopify.com/s/files/1/0430/8264/5665/files/tujolokafegojep.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_off00006ebe.bin
df8f95aaef7432c1e788feb5b42e6da8dd6d64592e861b77315bc16f4311f06f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EBE 5600 bytes
font_01_sfnt_off000081b6.bin
51ab11cb125f2cd15fd6ddbd9998f3df83d64c037804eace12504a8b256c5818		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81B6 11660 bytes

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