Malicious PDF — malware analysis report

Static analysis result for SHA-256 71676dc30b54275f…

MALICIOUS

PDF

43.1 KB Created: 2020-08-30 07:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 716420087466cecde67de7565b36c7b5 SHA-1: 3c9e1b75181d5aa73973216ff172dd331aafe5cc SHA-256: 71676dc30b54275f95ac8c02b93404849b8afa2f5c3e6e672d8a99696e18423a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external sites, including a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Planos de instalaciones hidrosanitar' and includes the malicious URL, suggesting a lure for SEO spam or phishing. 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.com/wix?keyword=planos+de+instalaciones+hidrosanitar
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0522/2813/files/yogurt_griego_alpina_informacion_nutricional.pdf
    • https://cdn.shopify.com/s/files/1/0433/4419/9829/files/gewitelirawunu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/volobufepafolosovi.pdf
    • https://cdn.shopify.com/s/files/1/0461/7558/4419/files/pmbok_guide_agile_pg.pdf
    • https://cdn.shopify.com/s/files/1/0435/1390/5311/files/mekawixamale.pdf
    • https://static.usrfiles.com/ugd/b8c837_4eaf1a20726649a9819615d39b2de5e6.pdf
    • https://static.usrfiles.com/ugd/3826db_fc1847d718e44a1fbab50b9a306de77a.pdf
    • https://static.usrfiles.com/ugd/9e53d4_37d5511836524e77b3162e69ec87af1e.pdf
    • https://static.usrfiles.com/ugd/cf14a4_3f736a33b8984e389f97288d20538bbf.pdf
    • https://static.usrfiles.com/ugd/b8c837_41ac5ccd51e14f04a62e0b6039b684e1.pdf
    • https://cdn.shopify.com/s/files/1/0433/3905/5253/files/katij.pdf
    • https://cdn.shopify.com/s/files/1/0435/9749/6488/files/facebook_chat_format_text.pdf
    • https://cdn.shopify.com/s/files/1/0434/5469/3541/files/86462788219.pdf
    • https://cdn.shopify.com/s/files/1/0429/9119/0167/files/antigens_and_antibodies.pdf
    • https://cdn.shopify.com/s/files/1/0431/8606/1463/files/pop_false_ceiling_design_catalogue.pdf
    • https://static.usrfiles.com/ugd/a2e20a_7af679e712cd42b6ac932145b5e18f93.pdf
    • https://static.usrfiles.com/ugd/79cb75_658822f20ddf4fa1bb0760016b58e1ab.pdf
    • https://static.usrfiles.com/ugd/4826f5_956fe58c65d040c2b7efc17313030cb0.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc49fc282ce94bc688b41131689e017e.pdf
    • https://static.usrfiles.com/ugd/4dd980_400fde05889f4acc82ae30c25f8c35c8.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_off0000694f.bin
0f0dba93cfb156b3268c4c7090369415f8dce9e501402bdafa03aceaff0784ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x694F 5028 bytes
font_01_sfnt_off00007a52.bin
cc13eb733a08f0356310aba0c71245367267fa3bd7ac9fdc2a09021b49f0be1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A52 11304 bytes

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