Malicious PDF — malware analysis report

Static analysis result for SHA-256 a066d71f0e64f69e…

MALICIOUS

PDF

51.4 KB Created: 2020-08-04 05:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 333232dab11789059ce60f3888ecf794 SHA-1: 2a15658736f3f214b3df619e16e7addb4463bffb SHA-256: a066d71f0e64f69e8bd25e16e3c2efe74e726b6a026237c39b4fdee332630a23
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to external PDF files hosted on various domains. One of these URLs, 'https://ttraff.com/pify?keyword=energias+alternativas+en+colombia+pdf', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of numerous links suggests a link farm or redirection strategy to lead users to malicious 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.com/pify?keyword=energias+alternativas+en+colombia+pdf
    • http://vajup.cheshiredem.org/uploads/1/3/1/4/131408029/durakad_sekarorobo_taxadeso.pdf
    • http://files.hannahtylerdesigns.com/uploads/1/3/1/4/131406234/lipawuvugafogid_sojinizolekedo_jeposonebitiva.pdf
    • http://files.countrysongfarm.com/uploads/1/3/1/4/131408364/kogiv.pdf
    • http://files.rolesvillehsband.com/uploads/1/3/1/8/131856276/7420843.pdf
    • http://files.thirtyninetyliving.com/uploads/1/3/2/8/132814415/39236.pdf
    • https://cdn.shopify.com/s/files/1/0440/4504/1814/files/blue_prism_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/3304/2839/files/ridulakezamulu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6618/6135/files/vatijubulodosiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vuvuwagel.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pejuzesuloroxutebed.pdf
    • https://cdn.shopify.com/s/files/1/0439/2042/5115/files/datastage_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0434/0423/0805/files/tifas.pdf
    • https://cdn.shopify.com/s/files/1/0432/8944/4510/files/46332550468.pdf
    • https://cdn.shopify.com/s/files/1/0430/3598/4029/files/75569306837.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tokon.pdf
    • https://cdn.shopify.com/s/files/1/0434/1114/4861/files/dasoridezipexemofepogu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6150/2362/files/3297778905.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c50.bin
ad25f156d98f4e443ad2d5377ac8938617eb37ddeae36b16f09c04c8800320f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C50 5632 bytes
font_01_sfnt_off00008f68.bin
32446ab5c3f1804bac73cf9fc8cb5f8dbe65b8748e2d45ce6f41c6ffddb6a7f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F68 15936 bytes

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