Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b5487edbda9f65c…

MALICIOUS

PDF

55.6 KB Created: 2020-08-08 12:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1b27ef4f4b320ee37a1b63222fd5d17 SHA-1: b7ac84748b3ef48d47ba9cfdbebb96cbe4634db5 SHA-256: 1b5487edbda9f65cb92700035fa2abe67a511c4abc6a5258f1e08637838a107f
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous external links, many hosted on Shopify. The primary malicious URL identified is https://ttraff.ru/pify?keyword=microscopio+optico+y+sus+partes+pdf, which is likely used to funnel victims to 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.ru/pify?keyword=microscopio+optico+y+sus+partes+pdf
    • http://files.healmylifemobile.com/uploads/1/3/2/6/132681342/9397033.pdf
    • http://files.caitlinpadilla.com/uploads/1/3/1/4/131453784/nubodubi_bizujut.pdf
    • http://jamija.kc-ink.com/uploads/1/3/1/3/131398008/parelovuvob.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1703/files/34893763875.pdf
    • https://cdn.shopify.com/s/files/1/0429/2568/6951/files/dowemajevaxufamewarajexat.pdf
    • https://cdn.shopify.com/s/files/1/0435/8648/6440/files/5742961761.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/68687581511.pdf
    • https://cdn.shopify.com/s/files/1/0434/4853/3144/files/aristotle_poetics_chapter_1.pdf
    • https://cdn.shopify.com/s/files/1/0433/7005/3782/files/bakekekopofu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6579/4969/files/bumulif.pdf
    • https://cdn.shopify.com/s/files/1/0430/9476/9821/files/12690771390.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/join_and_word.pdf
    • https://cdn.shopify.com/s/files/1/0429/7303/6697/files/mefafoxejepexuxarax.pdf
    • https://cdn.shopify.com/s/files/1/0437/1460/9303/files/70335548562.pdf
    • https://cdn.shopify.com/s/files/1/0432/6676/9054/files/angel_broking_closing_form.pdf
    • https://cdn.shopify.com/s/files/1/0432/2436/7262/files/13095472520.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e29.bin
a3490b01cce85e9b9db1b225694b068f4efcc8de6a101308b919e57e7e72a4e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E29 5224 bytes
font_01_sfnt_off00009016.bin
f614c0df9fa190e20fad187c242ccd65fb4ea2d7ce1cb362926794ee7ec7c9f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9016 13732 bytes
font_02_sfnt_off0000ba6f.bin
04c641d0aedeaa8c494855f42a2e9ae6fad9e3679126e7dc5c08fccc4b41c292		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6F 16112 bytes

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