Malicious PDF — malware analysis report

Static analysis result for SHA-256 68e7b6ba59e2ace4…

MALICIOUS

PDF

46.5 KB Created: 2020-08-28 23:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7adb85e5eeb8f4713e7df4943d38a8a8 SHA-1: 42780d9ad199a933758db4707995ea8dfa4bdcfb SHA-256: 68e7b6ba59e2ace46435c64bde226f43ed7bd1965989b246f76b341d72a1cc4b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, also contains the malicious URL. This suggests an attempt to lure users to malicious infrastructure, likely for further exploitation or phishing.

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.ru/wix?keyword=encuentros+maravillosos+chapter+3+vocab
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_8706d0520cde4725995667a63ef28ff4.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9cb98e7aaa244ebb303e8d3e69481bb.pdf
    • https://static.usrfiles.com/ugd/b8c837_95c02251716544b8ba687ac2450d4888.pdf
    • https://static.usrfiles.com/ugd/b8c837_271cbeca9dab4340b6fc9ed23a2e7d22.pdf
    • https://cdn.shopify.com/s/files/1/0433/7562/4350/files/kisatenos.pdf
    • https://cdn.shopify.com/s/files/1/0432/3206/7739/files/asus_x555ya-_rb81-_cb.pdf
    • https://cdn.shopify.com/s/files/1/0438/9624/2331/files/83385622456.pdf
    • https://cdn.shopify.com/s/files/1/0432/7188/0870/files/6838398719.pdf
    • https://cdn.shopify.com/s/files/1/0435/5584/8355/files/gijibumisu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3739/9957/files/88578569329.pdf
    • https://cdn.shopify.com/s/files/1/0429/3066/7673/files/dj_for_dummies.pdf
    • http://www.nytimes.com/2014/12/28/boo
    • 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_off000076b6.bin
06fc53c5c23eaf59e855f09b2e93f405b78a4318ec979f41d916e2b149ae99a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76B6 5492 bytes
font_01_sfnt_off00008939.bin
509e9c609e8b89f3ccaacadd4c05dbe15f834fe875bd4ab3bb02d4f9781237bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8939 10636 bytes

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