Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e7a5d0a2719091…

MALICIOUS

PDF

36.6 KB Created: 2020-08-18 14:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb57e958e5f5e31e795cc0ba6d8cc969 SHA-1: 5c92f44b9c7e2d55b1e1ca0bc760c5fec350c4fc SHA-256: 85e7a5d0a2719091d001c3cd92e683e3b801761fb902b44494526caef3a76a56
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 Shopify domains hosting other PDFs, forming a link farm. One prominent link directs to a known malicious redirector, indicating an attempt to funnel users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

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=adele+songbook+pdf
    • http://files.rogue-tshirts.com/uploads/1/3/1/3/131380126/raxomipomaxedobesa.pdf
    • http://files.nancyaronson.com/uploads/1/3/2/6/132695492/4087693.pdf
    • http://magul.redbird-designs.net/uploads/1/3/1/4/131453902/jivizugopajef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9672/7957/files/bumuzif.pdf
    • https://cdn.shopify.com/s/files/1/0456/9143/7215/files/cheating_spouse_app_android.pdf
    • https://cdn.shopify.com/s/files/1/0431/8799/4792/files/xewunibamok.pdf
    • https://cdn.shopify.com/s/files/1/0437/2316/1768/files/717814400.pdf
    • https://cdn.shopify.com/s/files/1/0432/3796/5986/files/paulo_coelho_aleph_franais_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kepudanunakadop.pdf
    • https://cdn.shopify.com/s/files/1/0427/4877/2508/files/cancer_de_colon_resumen.pdf
    • https://cdn.shopify.com/s/files/1/0431/3785/9735/files/current_concepts_of_bovine_mastitis.pdf
    • https://cdn.shopify.com/s/files/1/0430/3064/2837/files/karuvonexiti.pdf
    • https://cdn.shopify.com/s/files/1/0430/8919/9268/files/39083778294.pdf
    • https://cdn.shopify.com/s/files/1/0429/3646/7623/files/field_guide_to_geometrical_optics_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/8725/0087/files/65082487408.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_off000051d8.bin
7fcd57132ce0da0ad4648b7dd9a99b8b2ca4bd7cf9dca41ad9d4fc7427116565
pdf-font-stream PDF embedded font (sfnt) at offset 0x51D8 5096 bytes
font_01_sfnt_off00006349.bin
145be8c83fc76e00bc2a7af762e2a6659b8cd7607a92662592d810d40066fba3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6349 10128 bytes