Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e8ff0ca7e7c341…

MALICIOUS

PDF

54.2 KB Created: 2020-07-30 13:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c82b30e642b9a0ba0722cd270f5bdd89 SHA-1: 226602b9d0aa80f67152b5c2ed99917724ec3352 SHA-256: 63e8ff0ca7e7c34145a8da1f5d730c59a35c716db3c21fade923c8ab22b590f4
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute content from various sources. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the embedded links are the primary attack vector.

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=ielts+writing+task+1+book+pdf
    • http://files.someoneelsemovie.com/uploads/1/3/0/7/130776826/7223251.pdf
    • http://files.advancedmaterialsservices.com/uploads/1/3/0/7/130776230/nafumijaz.pdf
    • http://files.babyneenee.com/uploads/1/3/1/4/131438195/4128462.pdf
    • http://files.abbotswoodaction.org/uploads/1/3/2/7/132740350/lotoso_tewex_tabapirabuwit.pdf
    • http://files.samuelcolemanfamily.com/uploads/1/3/0/8/130874569/duxopunipudaminep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/1424/8857/files/30540020543.pdf
    • https://cdn.shopify.com/s/files/1/0434/2946/2165/files/95399643057.pdf
    • https://cdn.shopify.com/s/files/1/0440/8619/8424/files/18247811192.pdf
    • https://cdn.shopify.com/s/files/1/0430/7514/1794/files/nipolamexusum.pdf
    • https://cdn.shopify.com/s/files/1/0438/2123/6386/files/wazosegiz.pdf
    • https://cdn.shopify.com/s/files/1/0437/3794/0133/files/23850439959.pdf
    • https://cdn.shopify.com/s/files/1/0428/8679/1334/files/semewa.pdf
    • https://cdn.shopify.com/s/files/1/0432/8603/6646/files/6053472631.pdf
    • https://cdn.shopify.com/s/files/1/0432/8390/6724/files/raguzamodisosafojuda.pdf
    • https://cdn.shopify.com/s/files/1/0431/4021/9037/files/xuzexugubomemukew.pdf
    • https://cdn.shopify.com/s/files/1/0428/5094/3142/files/32981621994.pdf
    • https://cdn.shopify.com/s/files/1/0438/4853/2128/files/60245888203.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_off00009587.bin
d3804ea012b8201d41393d863858be4b2004df1de6b4d2726ccc274c9f49e775		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9587 5284 bytes
font_01_sfnt_off0000a792.bin
a78b1e3fd58e299d7274b292fe555c3609719125ba21c4e33a717631f7ac913d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA792 10480 bytes

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