Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c2be356f884bed5…

MALICIOUS

PDF

51.2 KB Created: 2020-08-07 12:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9d651166f3cf176ff16a5c4f1e10c00 SHA-1: 7e391351c6c57677505802eb729a9349ade4e598 SHA-256: 7c2be356f884bed58de9faaa70194a6cf94d6fddb49adc224b6b0a8b7c9e9064
152 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body text, though garbled, includes the string "Toeic speaking questions pdf", suggesting a lure. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, many of which point to potentially malicious or unknown domains. No scripts were extracted from this sample.

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/wb?keyword=toeic%20speaking%20questions%20pdf
    • http://gorejadag.craigformissouri.com/uploads/1/3/2/6/132695306/bdb3060a32.pdf
    • http://files.deltafuntime.com/uploads/1/3/1/3/131383493/d74bf4a9c49fb4.pdf
    • http://files.earningfreemoney.com/uploads/1/3/0/7/130739369/safezufugulura.pdf
    • https://cdn.shopify.com/s/files/1/0431/9507/2674/files/dark_matters_heroes.pdf
    • https://cdn.shopify.com/s/files/1/0431/3110/9538/files/87253096843.pdf
    • https://cdn.shopify.com/s/files/1/0431/6869/4432/files/18831136703.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6982/files/vefobetemixulit.pdf
    • https://cdn.shopify.com/s/files/1/0437/7388/6613/files/filipino_bread_recipes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wefudebavisizaku.pdf
    • https://cdn.shopify.com/s/files/1/0431/3320/6682/files/lacrosse_weather_station_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/1374/1472/files/derukaxawogibafoke.pdf
    • https://cdn.shopify.com/s/files/1/0431/3802/3581/files/69515163470.pdf
    • https://cdn.shopify.com/s/files/1/0440/9524/2392/files/josixifotilak.pdf
    • https://cdn.shopify.com/s/files/1/0433/5714/3205/files/56869213952.pdf
    • https://cdn.shopify.com/s/files/1/0435/5339/0741/files/balevubadaxavafizakawada.pdf
    • https://cdn.shopify.com/s/files/1/0432/7122/5494/files/gimodasi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56346524494.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/
    • https://cdn.shopify.com/s/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007449.bin
0bf4d92062d7f5f4f08d348fef2c5d3a4ec026034291a7695c07836a99e23f7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7449 5332 bytes
font_01_sfnt_off00008680.bin
a5b203bea5765821a1137fd893d8c1543538a1aae02aee958152501d65e64b5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8680 10268 bytes
font_02_sfnt_off0000a9a4.bin
e520551f6d7110f8957b583cbe702e64102ec3fa692e25d73777eaa2eb6b64c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9A4 16204 bytes

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