Malicious PDF — malware analysis report

Static analysis result for SHA-256 62391ebb0a06b3a8…

MALICIOUS

PDF

52.1 KB Created: 2020-08-20 01:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99fd3f843f4d0eebe2532c0b582109e8 SHA-1: 149fcd66857b90f5e7dc3211a20ccd61b9985247 SHA-256: 62391ebb0a06b3a8f9717ce5868b996df4be399fc4f79b4587c24a0168c725ef
154 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to benign Shopify URLs, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL and references a 'Hikvision camera installation guide' to lure victims. The ML classifier strongly indicates maliciousness, and the overall structure suggests a link farm used to distribute malware or phishing 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=hikvision+camera+installation+guide
    • http://files.hkcofc.com/uploads/1/3/2/6/132683111/lobojevaresale_jojolurirukekof_nunaduwarutare_rulilik.pdf
    • http://kadodevi.adelantechc.org/uploads/1/3/2/6/132682878/siwiruba-lebuduj-bunibuzowiwo-vofuxa.pdf
    • http://luzek.watersportsinkorea.com/uploads/1/3/1/4/131409546/zufivotekut.pdf
    • http://files.datamakers.com/uploads/1/3/0/9/130969231/sekuzun_debelel_tejiwege.pdf
    • http://files.impactcdyouth.com/uploads/1/3/2/7/132740462/b8b5e9e49aea.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/0379/5877/files/al_quran_sinhala_translation_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/8110/4541/files/sosunutulokutowilosokubev.pdf
    • https://cdn.shopify.com/s/files/1/0438/4620/5602/files/11th_science_biology_ncert_book_in_gujarati.pdf
    • https://cdn.shopify.com/s/files/1/0430/3529/5905/files/93939580502.pdf
    • https://cdn.shopify.com/s/files/1/0428/1267/0111/files/l_argumentation_juridique_stefan_goltzberg.pdf
    • https://cdn.shopify.com/s/files/1/0432/6549/1106/files/puzoxudenaga.pdf
    • https://cdn.shopify.com/s/files/1/0440/6060/6616/files/decimal_to_minutes_conversion_chart.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bukidesokat.pdf
    • https://cdn.shopify.com/s/files/1/0429/7264/3491/files/43132651987.pdf
    • https://cdn.shopify.com/s/files/1/0430/4207/8877/files/6811410582.pdf
    • https://cdn.shopify.com/s/files/1/0438/3349/1606/files/workplace_health_safety_and_welfare.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062d1.bin
3fd3d195882ab59e8cee97476908a30defe4c0d51665dc08356c387ea7ffacb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62D1 5224 bytes
font_01_sfnt_off00007471.bin
194facc5cf9cfb64739a4277290c81ef1a7629210afc74cbb964ddb8cf09ddd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7471 13596 bytes
font_02_sfnt_off00009f49.bin
aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F49 16312 bytes
font_03_sfnt_off0000b4d5.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D5 4324 bytes

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