Malicious PDF — malware analysis report

Static analysis result for SHA-256 8998e69f35fc96f7…

MALICIOUS

PDF

49.7 KB Created: 2020-09-06 22:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7fa6e9eec1d387ba8c018f4e2bcf5ae SHA-1: f2587b79121c0d856deafe9765a39a42f618ff2c SHA-256: 8998e69f35fc96f75a67e0d74c0e139bd87609c1f0a1ab6a8a02c177e3feb9bd
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains text related to 'Crystal report runtime for visual studio 2017', suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be a phishing lure leading to a malicious redirector.

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.link/wix?keyword=crystal+report+runtime+for+visual+studio+2017
    • https://cdn.shopify.com/s/files/1/0459/6164/2144/files/chloroform_banane_ki_vidhi_video.pdf
    • https://cdn.shopify.com/s/files/1/0428/7165/2508/files/zudumugetuberuluzon.pdf
    • https://cdn.shopify.com/s/files/1/0435/3127/2346/files/zupepekinukasasonopip.pdf
    • https://cdn.shopify.com/s/files/1/0430/4325/8522/files/koxolejivafafuzixibakeda.pdf
    • https://cdn.shopify.com/s/files/1/0429/1559/4393/files/38669125157.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/libudutumalokudel.pdf
    • https://static.usrfiles.com/ugd/838e7e_49f7126432a84ef4b683fcfa1fdbfe5c.pdf
    • https://static.usrfiles.com/ugd/bbd3cf_66372f7a55264bb7b79a0b368cc7f577.pdf
    • https://static.usrfiles.com/ugd/c1615c_40329a3376de41a5a7e5ab58f3fff49a.pdf
    • https://cdn.shopify.com/s/files/1/0427/9386/1279/files/jewilifuzonuzejuvekum.pdf
    • https://cdn.shopify.com/s/files/1/0463/0570/6144/files/divergent_study_guide_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/0623/8626/files/levegemobetironomijuritid.pdf
    • https://cdn.shopify.com/s/files/1/0431/6217/3602/files/fallout_4_vault_88_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/3945/7431/files/lofoguridu.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/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064dd.bin
6b33ff188d28154d6dbdbf812d80b7b44c2f9bc5adfe8bd5e5c9793c1c79fec7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64DD 6476 bytes
font_01_sfnt_off000074e5.bin
6d6a6b67b9b06e952540898f4a05c0f04f9a94bdec5943d84f1fe4d9f4c334db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74E5 5660 bytes
font_02_sfnt_off0000882b.bin
f3d6628a49653e26f7989e9e394c907a8f20129b3519d9dabd67dda7b91b83fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x882B 10144 bytes
font_03_sfnt_off0000aaea.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAEA 4324 bytes

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