Malicious PDF — malware analysis report

Static analysis result for SHA-256 821f77394408937f…

MALICIOUS

PDF

40.6 KB Created: 2020-08-06 19:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 375988a989dc580886f16580da8208b4 SHA-1: c89135c7e79eee7a39090000f7763243d26db7fb SHA-256: 821f77394408937f57816fd327bd1b25d75d1d462d0b3d60eca5dcc7fcc1e068
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing 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=calendar+worksheets+for+grade+4+pdf', suggesting a lure to disguise malicious activity. The presence of a link farm and a malicious redirector indicates an attempt to lead users to harmful 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=calendar+worksheets+for+grade+4+pdf
    • http://files.mounthebronstem.com/uploads/1/3/1/6/131606878/pirukirojafusox.pdf
    • http://files.brigittegranton.com/uploads/1/3/0/7/130739251/4758588.pdf
    • http://kagazi.thenaturalflame.com/uploads/1/3/1/3/131383791/87bfef78fd1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xazome.pdf
    • https://cdn.shopify.com/s/files/1/0430/4653/5322/files/letubefepetagumefije.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tuwaz.pdf
    • https://cdn.shopify.com/s/files/1/0437/9279/3757/files/cambio_climatico.pdf
    • https://cdn.shopify.com/s/files/1/0433/6123/9192/files/penawovuvojob.pdf
    • https://cdn.shopify.com/s/files/1/0432/0631/2098/files/41807231167.pdf
    • https://cdn.shopify.com/s/files/1/0434/5882/2296/files/48720024576.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/14402644841.pdf
    • https://cdn.shopify.com/s/files/1/0430/8670/8893/files/lujevuvamekonos.pdf
    • https://cdn.shopify.com/s/files/1/0438/8257/8088/files/pharmaceutical_calculations_ansel_15th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1642/files/69918034460.pdf
    • https://cdn.shopify.com/s/files/1/0431/4628/1121/files/xigigusulilokidemogi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4795/2294/files/xubiwewusubados.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_off00005fa5.bin
71559a19fdaaacf37adf2da5fc74501896a686fd5cef6fb110f4a994adbdcceb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA5 5452 bytes
font_01_sfnt_off00007242.bin
259a4ae212b287235ecfebb8d0d48d12b839943a69773d39648d1e053dffe5ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7242 10240 bytes

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