Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cbf69828162b861…

MALICIOUS

PDF

41.7 KB Created: 2020-08-14 11:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 254cae32b9f1ac490e6c5710ddeb66b5 SHA-1: aa25040e881e9919e61467c196ef246b39dbbfc3 SHA-256: 5cbf69828162b8615840e7f1596905e46d82ee5c8ad18c294c3152b36e577a73
162 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 a redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of a lure for a 'dictionary free for mobile phone'. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests a link farm or redirection scheme designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=dictionary+free++for+mobile+phone
    • http://files.authorkimfox.com/uploads/1/3/1/3/131379612/kemunafejebos_furugamoros_vagububike_wivosoruda.pdf
    • http://xojag.teenconcussion.com/uploads/1/3/0/8/130814761/xumux.pdf
    • http://files.spanishvillagetx.com/uploads/1/3/0/7/130775249/dunawujiri.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3962/9218/files/babiwusitinuvifibog.pdf
    • https://cdn.shopify.com/s/files/1/0436/2511/9904/files/94956086768.pdf
    • https://cdn.shopify.com/s/files/1/0432/7368/3100/files/41632659737.pdf
    • https://cdn.shopify.com/s/files/1/0431/6830/1212/files/2007_forest_river_rv_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/6640/9639/files/79708917777.pdf
    • https://cdn.shopify.com/s/files/1/0437/7686/8510/files/english_amplification_writing.pdf
    • https://cdn.shopify.com/s/files/1/0437/9269/5456/files/kuzagufonuvumefosawazonaz.pdf
    • https://cdn.shopify.com/s/files/1/0434/9906/1408/files/toofan_telugu_movie_online.pdf
    • https://cdn.shopify.com/s/files/1/0433/6828/4319/files/buddhist_holy_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vatajimawi.pdf
    • https://cdn.shopify.com/s/files/1/0436/1981/1490/files/oxford_picture_dictionary_english_french_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/1974/7996/files/20964418736.pdf
    • https://cdn.shopify.com/s/files/1/0436/1627/2547/files/wurupidukulipulowagetu.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_off000065c4.bin
4d8083b4ec758dbc260c516e93e3b28774678cd8844bd94abf0690c0550e62aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65C4 5320 bytes
font_01_sfnt_off000077b6.bin
7a90b26e21a82e5b0b9284ef80e533d2f347e375a241b3b59b7d654a8adc12f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77B6 10076 bytes

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