Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d70ec9232db5e95…

MALICIOUS

PDF

49.2 KB Created: 2020-08-16 00:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90948efe55b6e1cfcb9d0e077c8955c1 SHA-1: 537ccb14b1f2bb58ad9c366ba97f8432992f22ee SHA-256: 6d70ec9232db5e95b8544cd6c6a4adb72999e6fc239bf60e020caeb0690cd105
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to a guide and the malicious URL, suggesting a lure for users. The presence of many external links points towards SEO manipulation or a link farm tactic. No scripts were extracted, but the PDF structure itself facilitates the 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=endless+frontier+artifact+transcend+guide
    • http://zexake.nortonshoresparks.org/uploads/1/3/1/8/131856725/6535235.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/9073/8328/files/addison_wesley_science_10_textbook_online.pdf
    • https://cdn.shopify.com/s/files/1/0430/5528/4373/files/ripatudedozumulopi.pdf
    • https://cdn.shopify.com/s/files/1/0436/0211/6772/files/zekovanosuge.pdf
    • https://cdn.shopify.com/s/files/1/0431/5162/2306/files/dukaxal.pdf
    • https://cdn.shopify.com/s/files/1/0433/9774/2750/files/42168223730.pdf
    • https://cdn.shopify.com/s/files/1/0429/0940/1254/files/nalenawikiwubam.pdf
    • https://cdn.shopify.com/s/files/1/0429/2627/6774/files/cultural_beliefs_definition.pdf
    • https://cdn.shopify.com/s/files/1/0433/4069/3662/files/skyrim_ps3_mods.pdf
    • https://cdn.shopify.com/s/files/1/0431/4087/4408/files/alteraciones_geneticas_humanas.pdf
    • https://cdn.shopify.com/s/files/1/0429/8234/2815/files/information_security_analyst_job_description.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fe8.bin
979c502e69160ef1e916dfb9054d5fbd1bd825f8e809d4015f4f6925e84d2504		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE8 3932 bytes
font_01_sfnt_off00006dd9.bin
e27aadbf4f309172d731c6cfc137dda4a5f641e4e834125d6f07f8aaebd311d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD9 5148 bytes
font_02_sfnt_off00007f65.bin
609fafdccf83112dd65bcbe745672429957cfb167438df72d465e04c6f208465		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F65 10232 bytes
font_03_sfnt_off0000a283.bin
bb4620ae2308066493f479cb0495314a41e91f5b0bfb2a754d9bad2ef34af03d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA283 16060 bytes

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