Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1f5e1cf170f75d…

MALICIOUS

PDF

49.3 KB Created: 2020-08-25 21:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7484d1f88a944ab494ea2fbb46c96cd SHA-1: 9b6ea76c7b4c5f2990c37273da6c3440b6990078 SHA-256: 3a1f5e1cf170f75d410795f0ec1083616b89319dda2b6eb2f027faa0f8cae45e
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, identified as a link farm. One of these links, 'https://ttraff.ru/pify?keyword=cuentos+de+extraterrestres', is flagged as a known malicious redirector. The presence of a link farm and a malicious redirector strongly suggests an attempt to lure users to malicious sites, likely for phishing or malware delivery. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=cuentos+de+extraterrestres
    • http://fipewap.usasurvival.org/uploads/1/3/1/4/131407815/kozoleveli.pdf
    • http://jafuweki.sunrise-pta.org/uploads/1/3/2/8/132814930/tasit-nosagukivozudol.pdf
    • https://cdn.shopify.com/s/files/1/0432/7912/2587/files/42983458010.pdf
    • https://cdn.shopify.com/s/files/1/0456/9822/0188/files/nitalatibemidifakuveneg.pdf
    • https://cdn.shopify.com/s/files/1/0433/6238/6079/files/blase_blase_future_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/6258/2693/files/bankruptcy_act_bangladesh.pdf
    • https://cdn.shopify.com/s/files/1/0452/2960/5024/files/46263420298.pdf
    • https://cdn.shopify.com/s/files/1/0434/4745/1798/files/kajigosagetixigofeleja.pdf
    • https://cdn.shopify.com/s/files/1/0435/1610/0776/files/ata_taekwondo_forms.pdf
    • https://cdn.shopify.com/s/files/1/0429/0802/4985/files/polivegodigijesonag.pdf
    • https://cdn.shopify.com/s/files/1/0462/6006/0314/files/toilet_cleaning_chart_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/7108/6492/files/saxinameda.pdf
    • https://cdn.shopify.com/s/files/1/0440/1351/9006/files/disney_world_guided_fishing_excursions.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000083a0.bin
22fd20f253e6bd0a32492130f6edd3f6cfea45c121c5c6142365ad20b936c933		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83A0 4760 bytes
font_01_sfnt_off000093d9.bin
f10612849f5f98bc7cc36b5c8c7a027a35f623b89028fba4db336b1706c18504		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93D9 11308 bytes

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