Malicious PDF — malware analysis report

Static analysis result for SHA-256 6156ad11ec1c1aa3…

MALICIOUS

PDF

72.2 KB Created: 2020-08-12 05:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2668f907ef6fe4087b83efa7b48d50cd SHA-1: 399b251cdc4be3ca6089966b91d80d3499836e62 SHA-256: 6156ad11ec1c1aa35af2601977d663ed463844fc8c8a311c6e85daa7f7797fa3
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, a technique often used to create SEO link farms or to hide malicious redirects. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=jeffrey+archer+books+pdf'. The document body, though heavily obfuscated, contains references to 'Jeffrey archer books pdf' and 'wkhtmltopdf', suggesting a lure to download or access books. No scripts were extracted, but the presence of numerous links and the malicious redirector strongly indicate a phishing or malware distribution attempt.

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=jeffrey+archer+books+pdf
    • http://dipewik.sparklyoils.com/uploads/1/3/1/4/131453870/jikavufiraxedek_levad.pdf
    • http://files.futurestarsathletictraining.com/uploads/1/3/1/6/131637306/sibusetarapuluwop.pdf
    • http://fewefoduv.shamagika.com/uploads/1/3/1/4/131483281/a12a4833c60.pdf
    • http://files.panduct.com/uploads/1/3/1/1/131164129/tofematopapi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/7272/4900/files/mapa_politico_portugal.pdf
    • https://cdn.shopify.com/s/files/1/0438/1055/4016/files/null_in_python.pdf
    • https://cdn.shopify.com/s/files/1/0433/8096/5534/files/jonefuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/bapimafuk.pdf
    • https://cdn.shopify.com/s/files/1/0432/4687/8882/files/9058056342.pdf
    • https://cdn.shopify.com/s/files/1/0430/9634/2695/files/46972283885.pdf
    • https://cdn.shopify.com/s/files/1/0430/7258/5881/files/terapi_bronkiektasis.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/3096234486.pdf
    • https://cdn.shopify.com/s/files/1/0428/6860/5095/files/55100452685.pdf
    • https://cdn.shopify.com/s/files/1/0434/8936/2082/files/51602213943.pdf
    • https://cdn.shopify.com/s/files/1/0430/9712/9109/files/bekiluzalekipoxumajaluvom.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d053.bin
66722efbe3d84098bf5a87060f6434c76abb51d715f6de8a87b49b08c78d54c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD053 5060 bytes
font_01_sfnt_off0000e195.bin
0a85b6985a73c8d487409dda759025e4ef4102d2a23edcf0a44a80759ba522ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE195 10556 bytes
font_02_sfnt_off000105c7.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105C7 4324 bytes

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