Malicious PDF — malware analysis report

Static analysis result for SHA-256 63d55c0b776f98e5…

MALICIOUS

PDF

41.9 KB Created: 2020-08-24 22:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 998468406bd6933f3d41f55165914337 SHA-1: 22ab7b3bcd45c5076989ea08f9ef495f568cd673 SHA-256: 63d55c0b776f98e58bc8850ffe526437955299abed1406fb7a3eab3113b96037
154 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 benign Shopify domains, but one critical link directs to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=using+snackbar+android+studio', suggesting a lure to a malicious site. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=using+snackbar+android+studio
    • http://files.maritzavives.com/uploads/1/3/2/8/132815346/zotowelew_lotavapibo_zevubebesoden_sodagufeje.pdf
    • http://xupanase.solentfaa.co.uk/uploads/1/3/2/3/132303117/luzimabalonabu_vusigikofuwabif_xiluridafuselix_siranarofogew.pdf
    • http://files.katoutofbag.com/uploads/1/3/1/4/131437503/jilixelup_supekufox_pazuzagekil_nurik.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6926/8383/files/personality_psychology_larsen.pdf
    • https://cdn.shopify.com/s/files/1/0428/8492/3555/files/sidowe.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1641/files/95627249151.pdf
    • https://cdn.shopify.com/s/files/1/0434/1045/6726/files/wunex.pdf
    • https://cdn.shopify.com/s/files/1/0428/6968/6431/files/dixiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/1290/6405/files/78345995999.pdf
    • https://cdn.shopify.com/s/files/1/0428/9839/1196/files/bachelorette_australia_2018_tv_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/0535/3885/files/31756534833.pdf
    • https://cdn.shopify.com/s/files/1/0434/7972/8281/files/21493539403.pdf
    • https://cdn.shopify.com/s/files/1/0435/4015/2475/files/61738262447.pdf
    • https://cdn.shopify.com/s/files/1/0431/3314/1146/files/jdbctemplate_callablestatement_rowmapper.pdf
    • https://cdn.shopify.com/s/files/1/0431/9599/0175/files/92783216881.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_off000063fc.bin
d2102e8c73f3ae86d0c4d82ffd349118aba36c0c4888675032c1e78c3b9945b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63FC 5272 bytes
font_01_sfnt_off000075e8.bin
72d9a0064efd9ba05dcdf53e440a68bd24b03ecc05a2aa0bc128aa2d2651f47a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75E8 10804 bytes

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