Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b43a73b216a9bef…

MALICIOUS

PDF

56.2 KB Created: 2020-09-01 08:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fede9a8e893a4f1f187c430339afe67a SHA-1: 8a89160b7199ec848c39389c8b3db4840a5564a3 SHA-256: 5b43a73b216a9befdbef73081f7a0d10073a494f9169c444020c09e1c5c221ab
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting a financial document ('balance sheet proforma') which is likely a lure. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=balance+sheet+proforma
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/5ed537_fa8682075df842bdaec71dc3e29e93c5.pdf
    • https://static.usrfiles.com/ugd/70c1f8_58a80bd0fd874cddbb819f6594cca4ef.pdf
    • https://static.usrfiles.com/ugd/e1d12c_ff5b34a9e0b7433d9d955855afa1b737.pdf
    • https://static.usrfiles.com/ugd/77941b_61081d29c15449da9fd00197134c1657.pdf
    • https://static.usrfiles.com/ugd/ab059d_88deeb9dfeb84944ac623ae488236e7e.pdf
    • https://static.usrfiles.com/ugd/902d29_d0e5389fd732433684f691abdfca40c2.pdf
    • https://static.usrfiles.com/ugd/599026_57f62c952e744351b517dff2d2b480f7.pdf
    • https://static.usrfiles.com/ugd/8ba634_d68c3b02f77148ff8a64ede5f21d880d.pdf
    • https://static.usrfiles.com/ugd/b8c837_9585a4372f034e088ff4e54519a577d5.pdf
    • https://static.usrfiles.com/ugd/5a1791_de46242aad4b4826b2bd8fb12324ba9b.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e41fb55a0eb43d0b76671f3faa189dc.pdf
    • https://static.usrfiles.com/ugd/b11f6d_d347b254e1984d1fa6dcb2a9dca36e93.pdf
    • https://static.usrfiles.com/ugd/b8c837_78b162e72da3437086b193559b6a6bf9.pdf
    • https://static.usrfiles.com/ugd/bf650e_609aaa07e0c34bed8d66b7654e3f9514.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_off00009fa7.bin
235b1dfc1c92ab412ad4cb8fa9c8ec26534e3093c972d1301d8b868c3a337714
pdf-font-stream PDF embedded font (sfnt) at offset 0x9FA7 5304 bytes
font_01_sfnt_off0000b182.bin
9e8845eb61e127cdb55d4b818e8443371c269747a27e3903b86553ee062a2209
pdf-font-stream PDF embedded font (sfnt) at offset 0xB182 10212 bytes