Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ce27c91dd5b159…

MALICIOUS

PDF

44.7 KB Created: 2020-08-07 21:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf499d6b4c31b679af5567eaddb933bb SHA-1: 692279f30a43877723d5735dc0b4b1d07242ced5 SHA-256: 63ce27c91dd5b15925c0cdf9e17384011762953374b8b6674c28c75fd645f7c8
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to a known malicious redirector, which is further supported by the presence of a large number of external PDF links, suggesting a link farm. The document body, though heavily obfuscated, contains the malicious URL, indicating an attempt to direct users to malicious infrastructure. 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.com/pify?keyword=angina+pektoris+tidak+stabil+adalah+pdf
    • http://files.sunnybrookranch.com/uploads/1/3/1/3/131398583/1c90e78866.pdf
    • http://files.helenmccreery.com/uploads/1/3/2/6/132681851/1689e5294eda414.pdf
    • http://files.mirocku.com/uploads/1/3/0/7/130776215/mazojir_jupimososezife_nowaziw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/8570/2054/files/dowesiguvif.pdf
    • https://cdn.shopify.com/s/files/1/0437/6113/9861/files/bank_of_america.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/nijovesokut.pdf
    • https://cdn.shopify.com/s/files/1/0431/9435/1778/files/91021342054.pdf
    • https://cdn.shopify.com/s/files/1/0430/1045/7753/files/14165886451.pdf
    • https://cdn.shopify.com/s/files/1/0433/4059/5352/files/gukedafemanisejapudid.pdf
    • https://cdn.shopify.com/s/files/1/0435/4002/1407/files/36366604872.pdf
    • https://cdn.shopify.com/s/files/1/0438/3732/5472/files/black_belt_karate_the_intensive_course.pdf
    • https://cdn.shopify.com/s/files/1/0432/3734/3387/files/dixusebokigave.pdf
    • https://cdn.shopify.com/s/files/1/0429/5639/0559/files/84913957553.pdf
    • https://cdn.shopify.com/s/files/1/0438/5295/5810/files/mikisarugilit.pdf
    • https://cdn.shopify.com/s/files/1/0434/9100/0472/files/zixanunux.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_off000070e9.bin
42a4a1a202b1f9918b33796398095b8f4e380d6dbb1cb34c12a1173724073934
pdf-font-stream PDF embedded font (sfnt) at offset 0x70E9 5496 bytes
font_01_sfnt_off00008391.bin
0797fe017041187aab11e9fc2dd2ae7bc28f31ab858c42ff0913805e65803d88
pdf-font-stream PDF embedded font (sfnt) at offset 0x8391 9888 bytes