Malicious PDF — malware analysis report

Static analysis result for SHA-256 05408ca44a900fe2…

MALICIOUS

PDF

47.8 KB Created: 2020-09-09 05:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee6aa687f4844e57e717639226316374 SHA-1: 769b3b0ae9467c32ab652aa6e974fc3254e24730 SHA-256: 05408ca44a900fe26a188d7d96beb6189dd7ca30679b889139e23761c2c410bc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to a known malicious domain, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to trick users into clicking it. The ML classifier also strongly flagged this PDF as malicious.

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.club/wix?keyword=bridge+to+terabithia+full+book+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/9a242c_6dea8ed4d9d840ab803e5c737c192673.pdf
    • https://static.usrfiles.com/ugd/b77b08_8bee1fe2abf146a0bff1845d7ee29f62.pdf
    • https://static.usrfiles.com/ugd/a32c20_12f383f2fbfe4a19a591e43a66fef2a4.pdf
    • https://cdn.shopify.com/s/files/1/0440/5084/1750/files/jogijujujadutosixeluxeb.pdf
    • https://cdn.shopify.com/s/files/1/0460/5771/7915/files/multiplying_matrices_worksheet_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/5883/9198/files/dezakuvof.pdf
    • https://cdn.shopify.com/s/files/1/0430/8772/4704/files/3rd_grade_math_spiral_review.pdf
    • https://cdn.shopify.com/s/files/1/0437/7529/5640/files/aromatic_compounds_mcqs.pdf
    • https://cdn.shopify.com/s/files/1/0429/5196/6873/files/46620074582.pdf
    • https://static.usrfiles.com/ugd/52b593_fa90c0f949664801a758bdcd438fbb27.pdf
    • https://static.usrfiles.com/ugd/4117a9_5ec842aecaba44c89f8849db41fadd46.pdf
    • https://static.usrfiles.com/ugd/19103d_3125ce84f60d4554be6a30db5e7d6a74.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_off00007b8d.bin
6114267319a56894010ef229a50903269810e7acf16c047223fed0c2456c9208
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B8D 5380 bytes
font_01_sfnt_off00008dd1.bin
b5638612ecfa1286346453d065d186912f66c507af6f15b3c51ba05b01de3e3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8DD1 10272 bytes