Malicious PDF — malware analysis report

Static analysis result for SHA-256 7914f16c70729237…

MALICIOUS

PDF

43.4 KB Created: 2020-08-12 20:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94a6edb2aa6ac52656c1667c060ad5b2 SHA-1: 31ac0033d331dd490c48523c9da881a3f463099b SHA-256: 7914f16c707292379b439e3a5d0e8842006d723763721e90d242767b5111c95c
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL as the malicious link, suggesting an attempt to trick users into clicking it. The ML classifier also strongly indicated maliciousness.

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.cc/wb?keyword=order%20decimal%20numbers%20worksheet
    • http://files.sancreedparishcouncil.org/uploads/1/3/2/6/132682076/c55c89832489c.pdf
    • http://juvil.meridiansshiatsu.com/uploads/1/3/0/8/130814011/danivekum_sasirujokim_vevolepovex.pdf
    • http://files.carriesrealworld.com/uploads/1/3/2/6/132681517/tofijururi-bezar-wuburem.pdf
    • http://files.louisnyikon.com/uploads/1/3/1/3/131383838/sowumikazuzik.pdf
    • http://resan.travelwithcarnetha.com/uploads/1/3/2/7/132740285/dujigibaxaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5934/6582/files/neutrino_hypothesis_of_beta_decay.pdf
    • https://cdn.shopify.com/s/files/1/0431/0722/1658/files/fezofegajip.pdf
    • https://cdn.shopify.com/s/files/1/0428/3308/4575/files/posilagajofegemef.pdf
    • https://cdn.shopify.com/s/files/1/0444/2108/7398/files/tybsc_cs_syllabus_mumbai_university_2020_19.pdf
    • https://cdn.shopify.com/s/files/1/0431/1279/2221/files/marathi_kadambari_download_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/1324/9944/files/aha_acls_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/5468/6617/files/kemexi.pdf
    • https://cdn.shopify.com/s/files/1/0435/3628/5860/files/darklight_memento_mori_rules.pdf
    • https://cdn.shopify.com/s/files/1/0428/4334/0956/files/93264093415.pdf
    • https://cdn.shopify.com/s/files/1/0430/4958/2743/files/typhoid_fever_report.pdf
    • https://cdn.shopify.com/s/files/1/0431/6214/0840/files/59762361809.pdf
    • https://cdn.shopify.com/s/files/1/0431/3694/2234/files/kmov_doppler_weather_radar.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_off00006af0.bin
5c7b2846db4f05a498945b64ad6659968a87d57dc6aa19b5659b12fa5e9ae27e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF0 5500 bytes
font_01_sfnt_off00007d7f.bin
a9e52c1c9a75e1ea6caecab78295217254e6154bfd65176237e03c8ddf37fc10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D7F 10464 bytes

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