Malicious PDF — malware analysis report

Static analysis result for SHA-256 7557274a1b90d616…

MALICIOUS

PDF

42.4 KB Created: 2020-08-30 21:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2db3caa31e0ec31be8abcf3f671a63ac SHA-1: db92c4ce24c0e50361851c882faf0b8969d5cbd7 SHA-256: 7557274a1b90d61618064d0c61e8181aaefb8c786bd6675276f840dc3d9ea082
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that point to a known malicious redirector, indicating an attempt to lead the user to harmful content. The document body, though partially obfuscated, includes the malicious URL and appears to be a lure related to scientific information. The presence of numerous PDF links, many pointing to benign resources, suggests a link farm or SEO manipulation tactic to disguise the malicious intent.

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=modern+periodic+table+of+elements+with+names+and+symbols+and+atomic+mass+and+atomic+number+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/91e123_a9a5a1b65a844dbea3c36674c6c63c11.pdf
    • https://static.usrfiles.com/ugd/8b97dd_1310aa3f7c4b4926a694abf58e941513.pdf
    • https://static.usrfiles.com/ugd/f3cb45_8943c82703224130aff5cd787df63fd3.pdf
    • https://static.usrfiles.com/ugd/b8c837_35396f3a25dc4e48b77620c942a71c0f.pdf
    • https://static.usrfiles.com/ugd/74e905_536d0a7261f0481f9fb56b8c4f53fa9e.pdf
    • https://static.usrfiles.com/ugd/7c30af_987940f36e4d4e648578cba6e958fde6.pdf
    • https://static.usrfiles.com/ugd/24853a_b8ab9465576341158fe2bdb5926bfe13.pdf
    • https://cdn.shopify.com/s/files/1/0436/5670/8254/files/gnu_gcc_compiler_code_blocks.pdf
    • https://cdn.shopify.com/s/files/1/0437/8093/1733/files/webulaburikasoro.pdf
    • https://cdn.shopify.com/s/files/1/0432/7338/8190/files/zaxerujosevogu.pdf
    • https://cdn.shopify.com/s/files/1/0437/9380/9557/files/best_calculator_vault_app_android.pdf
    • https://static.usrfiles.com/ugd/0bcf16_ee88158b53bf4b1b81f52258438e0c6a.pdf
    • https://static.usrfiles.com/ugd/b8c837_82eff5da619c43febc61b3dbc129ae41.pdf
    • https://static.usrfiles.com/ugd/e6092c_c0914a05fb5f4c188c4105e16cc8f131.pdf
    • https://static.usrfiles.com/ugd/67e251_81d27b9014aa4f82ba8009520cf8ecf3.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_off0000642c.bin
aa43cdb3b0fc79b1ea552a58a44a9eb09f688d2fe6dd227273431a0e3225f61c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x642C 5732 bytes
font_01_sfnt_off0000778f.bin
144d2f9300a6c01c2ee54ec8f387571a3c5050c3cdb76aeac094899d2074db12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x778F 10472 bytes

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