Malicious PDF — malware analysis report

Static analysis result for SHA-256 a780b2c1537cff16…

MALICIOUS

PDF

47.1 KB Created: 2020-08-09 01:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e81afda500183c656338ffc5b1778fe8 SHA-1: 8d95c4d7fba577b1b2b7bea41efd7e66bbc3562b SHA-256: a780b2c1537cff169c876c3cebdba0b32c09188b8112f1443a459705a6bc6291
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body also contains the URL 'https://ttraff.com/pify?keyword=carol+of+the+bells+piano+pdf+easy', which is likely used to redirect the user to a malicious site. Another embedded URL, 'https://cdn.shopify.com/s/files/1/0430/0816/3993/files/45830135713.pdf', is also present, though its reputation is unknown. The PDF's structure and embedded links suggest a social engineering attack to trick users into visiting a harmful website.

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=carol+of+the+bells+piano+pdf+easy
    • http://files.alisonalbrecht.com/uploads/1/3/1/3/131378774/wetej_kanaxobonebufix_kilulipoxisov.pdf
    • http://files.merutech.com/uploads/1/3/2/8/132816195/8288944.pdf
    • http://files.clarksmithphotography.com/uploads/1/3/0/8/130874204/zadexoxemodifef-golozazubizop-nifemavevug.pdf
    • https://cdn.shopify.com/s/files/1/0430/0816/3993/files/45830135713.pdf
    • https://cdn.shopify.com/s/files/1/0434/4971/2806/files/femaxuka.pdf
    • https://cdn.shopify.com/s/files/1/0434/7455/0950/files/29847574040.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/winoxilerudizixadejugo.pdf
    • https://cdn.shopify.com/s/files/1/0441/0854/6200/files/feedback_control_of_dynamic_systems_6th.pdf
    • https://cdn.shopify.com/s/files/1/0432/0762/2817/files/wajepinojokapigonegizame.pdf
    • https://cdn.shopify.com/s/files/1/0439/4532/8808/files/wekarukudasudalajag.pdf
    • https://cdn.shopify.com/s/files/1/0437/5845/2897/files/rails_scaffold_controller.pdf
    • https://cdn.shopify.com/s/files/1/0433/5042/5765/files/63730675385.pdf
    • https://cdn.shopify.com/s/files/1/0435/2521/0263/files/fesosufo.pdf
    • https://cdn.shopify.com/s/files/1/0433/1785/4373/files/aikido_technique.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000568f.bin
e6671940466b3c69fa86293d23c849da970e6e467b0a21f4d876416a4ba3cb70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x568F 5276 bytes
font_01_sfnt_off00006877.bin
01e48a083cc24930c02e9f5a7ef4eb5ca8642f9cb766e54d0ef80a25904cb93d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6877 15248 bytes
font_02_sfnt_off00009801.bin
2cfc97915d250804213c9b0e6ad261e0979cd38371fb36ec9174dea58a153a3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9801 16120 bytes

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